SSC CHSL 6 Dec 2015 Shift 1 Paper

Question : 144 of 200

Marks: +1, -0

If 5416 x 6 is a perfect square, then the digit at ‘x’ is:

Solution:

A perfect square ending with '6' can only have an odd digit at its ten's place, i.e. second last digit. Thus second and last options are eliminated.
Now,

√541656 < 736

and

√541696 = 736

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