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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

Correct Answer : D.



We know that 112 = 121.
Putting m = 11 and n = 2, we get:
(m - 1)n + 1 = (11 - 1)(2 + 1) = 103 = 1000. 

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