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That's the answer if the cats are distinct.

Re: 2015 permutation X2 marathon I'm pretty sure your only mistake was in miscounting the number of doubles. As long as there is at least one single letter, you just fix that letter, then arrange the others around it. That is arrange 10 letters containing 3 doubles, so 10! / (2!)^3...

Re: 2015 permutation X2 marathon But AAABBBC is 6!/3!3!, no?

Re: 2015 permutation X2 marathon Are you referring to a non-invertible circle like a table, or an invertible circle like a necklace?

It is like many topics - it is easy once it clicks. For many people it never clicks. In that respect it is kind of like Counting.

Re: Harder HSC Papers I honestly don't think P(0,0) is meaningful. I can see why it could be equal to zero as much as why it could be equal to one (though I don't think I can put it into words). I see it in kind of a similar way to 0^0 being undefined.

The Ext 2 Cambridge is great for revision. But it is terrible for instruction.

Re: Harder HSC Papers 2000 was notoriously difficult. It suddenly switched from very doable do very difficult about half way through, so didn't discriminate well between students of different abilities.

Ranks are NOT matched to HSC marks. For the purpose of arriving at your final assessment mark, internal MARKS are matched to HSC marks. As long as you are in a large enough cohort and not near the top or bottom, there is really no need to even worry about it.

No, only the top ranked internal result will receive the top ranked exam mark for their assessment. That doesn't apply for the other ranks. Your two assessment marks will reflect the internal spread regardless of the mark difference between those two ranks in the external. ie. they will be...

Never watch wrestling. And never heard of the latter two.

Never heard of him or seen that face. But then I don't watch trashy TV.

I don't know that name.

The rock? I don't understand that? I won't be saying which one is correct (and which one is half correct).

1.5 out of 4

Actually I've found your problem. The question says x is the distance above the earth's surface, not the centre of the earth. So the initial conditions are x=0, v=400.

You'll have to post your solution.

Have you subtracted the earth's radius from the final x value? Edit: Oops - read the question wrongly.

I've never owned a suit. And I haven't worn a hired suit for 26 years. And I'm pretty sure I can't remember how to do up a tie.

I really think moderators should be removing requests for illegally sent copies.