Property 8 For every natural number n ,`(n+1)^2 - n^2 = (n+1) + n`

For natural number n , 2^n (n-1)!lt n^n , if

For every natural number n, 3 ^(2n+2)-8n -9 is divisible by 8

Statement -1 For each natural number n,(n+1)^(7)-n^7-1 is divisible by 7. Statement -2 For each natural number n,n^7-n is divisible by 7.

The mean of first n odd natural number is (a) (n+1)/2 (b) n/2 (c) n (d) n^2