Q160
If mn = 169, what is the value of (m + 1)(n - 1)?
A.
14
AnswerB.
13
C.
196
D.
170
Answer: Option A
Solution
Answer: Option A
Solution:
mn = 169mn = 132
⇒ m = 13, n = 2
∴ (m + 1)(n - 1)
= (13 + 1)(2 - 1)
= 14