If mn = 169, what is the value of (m + 1)(n - 1)?
A. 14
B. 13
C. 196
D. 170
Answer: Option A
Solution (By Examveda Team)
mn = 169mn = 132
⇒ m = 13, n = 2
∴ (m + 1)(n - 1)
= (13 + 1)(2 - 1)
= 14
This Question Belongs to Arithmetic Ability >> Surds And Indices
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