harshdeep12 wrote:
If f(n)=4^n-3^n and n is a positive integer, is b – a at least four times the value of f(n)?
(1) a = 2 and n= 3
(2) a=3^n+1 and b=4^n+1
This is a copy of the following OG question: https://gmatclub.com/forum/if-n-is-a-po ... 44344.html