K kev-kun Member Joined Mar 24, 2011 Messages 157 Location Sydney, Australia Gender Male HSC 2014 Mar 22, 2014 #1 Also are we allowed to use induction or?
I iStudent Well-Known Member Joined Mar 9, 2013 Messages 1,158 Gender Male HSC 2014 Mar 22, 2014 #2 use the binomial expansion for (1+x)^n and set x = 2^3 then you should see the answer around the corner (note - 3^2k = 9^k)
use the binomial expansion for (1+x)^n and set x = 2^3 then you should see the answer around the corner (note - 3^2k = 9^k)
K kev-kun Member Joined Mar 24, 2011 Messages 157 Location Sydney, Australia Gender Male HSC 2014 Mar 22, 2014 #3 Oh wow... haha thank you for that