If m and n are whole numbers such that mn=121, the value of (m-1)n+1 is
A
1000
B
121
C
10
D
1
Correct Answer: 1000
We know that (11)^2 = 121. Putting m = 11 and n = 2, we get: (m - 1)^(n + 1 ) = (11 - 1)^(2 + 1) = (10)^3 = 1000