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If mn = 169 what is the value of (m +...

This question belongs to Arithmetic Ability Surds And Indices
Surds and Indices
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If mn = 169, what is the value of (m + 1)(n - 1)?

Answer & Solution
Correct Answer: Option A
mn = 169
mn = 132
⇒ m = 13, n = 2
∴ (m + 1)(n - 1)
= (13 + 1)(2 - 1)
= 14
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