ISI2015-DCG-19

Question

The expression $3^{2n+1} + 2^{n+2}$ is divisible by $7$ for

• A. all positive integer values of $n$
• B. all non-negative integer values of $n$
• C. only even integer values of $n$
• D. only odd integer values of $n$

Answer 1

 

Option (A) is the correct answer.

Comments

if you put n=0, then also it is divisible by 7.

So, the answer will be:- B.all non-negative integer values of n

---

Yes answer should be B? Non negative includes 0.