basis:
hypothesis:
finished. We have 7 times a multiple of 9 and 7 times a multiple of 63, which is also divisble by 9.
* actually there is an error here- can someone do n = 2 for me?
for 3)
Could somebody help me with these questions? I just need to prove that n=k+1 using the assumption for n=k
Prove:
1) 7^2n - 48n -1 for 2304 for n=1,2,3...
2) (3n+1).7^n -1 is divisible by 9 for n=1,2,3...
3) 10^n +3[4^(n+2)] +5 is divisible by 9 for n=1,2,3...
Thank you !