If m and n are whole numbers such that mn = 121, the value of (m – 1)n + 1 is:

Question:
If m and n are whole numbers such that mn = 121, the value of (m – 1)n + 1 is:

[A].

1

[B].

10

[C].

121

[D].

1000

Answer: Option D

Explanation:

We know that 112 = 121.

Putting m = 11 and n = 2, we get:

(m – 1)n + 1 = (11 – 1)(2 + 1) = 103 = 1000.