Explanation:

Sol. Ans.(b).

(10ⁿ + 1) will have sum of digits 2 for any whole number n. Whole numbers are integers starting with 0. Just put different value of n and observe yourself.

For n = 0, 10⁰ + 1 = 1 + 1. So sum is 2.

For n = 1, 10¹ + 1 = 11. So sum is 1 + 1 = 2.

For n = 2, 10² + 1 = 100 + 1 = 101. So sum is 1 + 1 = 2.

So the correct option is (b).