combinatorics probability question about cards (1 Viewer)

[waltssillyhat]

this question is part of a 'using counting in probability' part of my textbook and i'm stuck on part (d). i tried working it out, but my answers are different from the textbook's (which is 1/425). any help would be appreciated <3

 

[jane1820]

girl ur looking at either the wrong question or wrong answer
bc 16/5525 is the answer to g and not d

 

[Hehehe22]

girl ur looking at either the wrong question or wrong answer
bc 16/5525 is the answer to g and not d
View attachment 47763

Where did you get the Camb worked solutions from?

 

[jane1820]

Where did you get the Camb worked solutions from?

I have the whole Cambridge ext 1 worked solutions
my tutor sent to me before i left tutoring

 

[waltssillyhat]

girl ur looking at either the wrong question or wrong answer
bc 16/5525 is the answer to g and not d

oh yeah i meant to put 1/425 in the post i have the worked solutions as well but i don't understand why they used 13C1 and 4C3

 

[Shavi Masee]

why is everyone so locked in

 

[Study to success]

why is everyone so locked in

Yeah I still haven’t done the math exercises. I’ll just do it tmrw

 

[jane1820]

oh yeah i meant to put 1/425 in the post i have the worked solutions as well but i don't understand why they used 13C1 and 4C3

The total is 52C3=22100 bc with no restrictions thats the total
13C1 bc from one suit you’re choosing a random card
4C3 bc u already chose one random card and you want to choose 3 remaining

13C1 = 13
4C3 = 4
and since it’s an ‘and’ question u multiply hence 13x4
and since it‘s a probability so number of outcome over total outcomes hence 13x4/22100

 

[jane1820]

Yeah I still haven’t done the math exercises. I’ll just do it tmrw

Study maybe the reason you’re not doing well in school and your subjects is because you keep on procrastinating and delaying work, what’s your excuse? Is this how you tend to live? Might as well drop out of school, saves you time

Spoiler: Go study tf

im being mean to motivate you, but seriously go study

 

[Hehehe22]

I have the whole Cambridge ext 1 worked solutions
my tutor sent to me before i left tutoring

Ohhh what that's so useful

 

[Study to success]

Study maybe the reason you’re not doing well in school and your subjects is because you keep on procrastinating and delaying work, what’s your excuse? Is this how you tend to live? Might as well drop out of school, saves you time

Spoiler: Go study tf

im being mean to motivate you, but seriously go study

lol ur calling me out today. Why is everyone being so mean to me today? I guess it’s my karma from the other day. But I do study but i just haven’t being studying as much as I did before due to my lack of motivation, self esteem, bad mental health

 

[Study to success]

Study maybe the reason you’re not doing well in school and your subjects is because you keep on procrastinating and delaying work, what’s your excuse? Is this how you tend to live? Might as well drop out of school, saves you time

Spoiler: Go study tf

im being mean to motivate you, but seriously go study

I wish I could drop out. I would actually be doing much more useful things

 

[Study to success]

Study maybe the reason you’re not doing well in school and your subjects is because you keep on procrastinating and delaying work, what’s your excuse? Is this how you tend to live? Might as well drop out of school, saves you time

Spoiler: Go study tf

im being mean to motivate you, but seriously go study

Also being mean doesn’t motivate me. It just demotivates me. That’s why I have no motivation cause the English department especially and all the other teachers have destroyed my self esteem too much

 

[jane1820]

lol ur calling me out today. Why is everyone being so mean to me today? I guess it’s my karma from the other day. But I do study but i just haven’t being studying as much as I did before due to my lack of motivation, self esteem, bad mental health

What happened the other day

hm i see i get ur point but maybe ur having mental health issues due to lack of studying, maybe it’s bc ur not putting in much effort resulting in bad marks which negatively affects you

 

[jane1820]

I wish I could drop out. I would actually be doing much more useful things

thats so real, i rlly want to start my own business
i can embroider, crochet, knit and design so i have all the skills needed to start small

Also being mean doesn’t motivate me. It just demotivates me. That’s why I have no motivation cause the English department especially and all the other teachers have destroyed my self esteem too much

im sorry also tbh nothing motivates me like AT ALL so i just do the work, bc then it’s not motivation it’s discipline

 

[Study to success]

What happened the other day

hm i see i get ur point but maybe ur having mental health issues due to lack of studying, maybe it’s bc ur not putting in much effort resulting in bad marks which negatively affects you

I was just dissing English and people who liked SAC and creative over essays, trig over graphing and I shit talked Shakespeare. But I’ve always had mental health issues but like I feel like it’s my bad marks that’s contributing it cause I did so much better last year and now that I’m doing much worse has kinda demotivated me causing me to procrastinate more

 

[jane1820]

I was just dissing English and people who liked SAC and creative over essays, trig over graphing and I shit talked Shakespeare. But I’ve always had mental health issues but like I feel like it’s my bad marks that’s contributing it cause I did so much better last year and now that I’m doing much worse has kinda demotivated me causing me to procrastinate more

1. so what if u shit talked and dissed others (its an opinion), ppl can not be that sensitive, grow up
2. i feel so too, ig the solution is to discipline urself if motivation doesnt work, thats ur solution

 

[Study to success]

1. so what if u shit talked and dissed other, ppl can not be that sensitive, grow up
2. i feel so too, ig the solution is to discipline urself if motivation doesnt work, thats ur solution

Yeah that’s what I’ve been tryin to do but like it’s just so painful and it makes me more depressed and it’s just this viscous cycle

 

[waltssillyhat]

The total is 52C3=22100 bc with no restrictions thats the total
13C1 bc from one suit you’re choosing a random card
4C3 bc u already chose one random card and you want to choose 3 remaining

13C1 = 13
4C3 = 4
and since it’s an ‘and’ question u multiply hence 13x4
and since it‘s a probability so number of outcome over total outcomes hence 13x4/22100

is 4 used in 4C3 because there's 4 suits in a deck? also if i already chose one random card in 13C1 and i wanted to choose the remaining ones wouldn't i be choosing two remaining ones since i'm picking 3 cards total?

 

[jane1820]

is 4 used in 4C3 because there's 4 suits in a deck? also if i already chose one random card in 13C1 and i wanted to choose the remaining ones wouldn't i be choosing two remaining ones since i'm picking 3 cards total?

I see ur confusion
1. No its not for the suits bc then you’re eliminating an option it should be 4C1 but 4C3 is the same due to pascal’s triangle
2. it‘s meant to be 13C3 instead of 13C1 bc you’re choosing 3 from 13: there was a typo
3. Total is 52C3
4. 4x13C3/52C3 = 22/425
5. The answer provided is incorrect