Question

If 49n + 16n + k is divisible by 9 for all n€ N then k =​

Answer 1

Step-by-step explanation:

Answer

Correct option is

B

−1

For n=1, we have

49

n

+16n+λ=49+16+λ=65+λ=64+(λ+1), which is divisible by 64 if λ=−1.

For n=2, we have

49

n

+16n+λ=49

2

+16×2+λ=2433+λ=(64×38)+(λ+1), which is divisible by 64 if λ=−1

Hence, λ=−1.

Answer 2

Answer:

here let n = 1

then k will be 7

similarly ...

if n = 2 then ,, k will be 5