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

1
10
121
1000
Explanation:

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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