The number 1422 - 1 is divisible by

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Examveda

The number 142² - 1 is divisible by :

A. 19

B. 7

C. 9

D. 13

Answer: Option D

= 142² - 1
= (142 - 1) (142 + 1) [a² - b² = (a - b) (a + b)]
= 141 × 143
= 141 × 11 × 13

This Question Belongs to Arithmetic Ability >> Number System

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