Let a_n _ n=1 ^ be a sequence such that a_1 = 1, a_2 = 1 and a_ n+2 =2a_ n+1 +a_n for all n 1. Then the value...

Question

Let a_n _ n=1 ^ be a sequence such that a_1 = 1, a_2 = 1 and a_ n+2 =2a_ n+1 +a_n for all n 1. Then the value of 47 _ n=1 ^ a_n 8^ 3n is equal to _____.

Accepted Answer

7

JEE Main 2021 Mathematics question

Solution