Question 141

The number $$142^{2}-1$$ is divisible by

Solution

Number = $$(142)^{2}-(1)^2$$

Using, $$a^2-b^2=(a-b)(a+b)$$

= $$(142-1)(142+1)$$

= $$141\times143$$

= $$(3\times47)\times(11\times13)$$

Thus, it is divisible by 13.

=> Ans - (C)

Share on Whatsapp Share on Whatsapp

Create a FREE account and get:

Free SSC Study Material - 18000 Questions
230+ SSC previous papers with solutions PDF
100+ SSC Online Tests for Free

Follow us on

Boost your Prep!

Download App