Mass Communication and Journalism 2019 Solved Paper

Question : 74 of 150

Marks: +1, -0

Select the one which is different from other three alternatives.

Solution:

Except 78, in all others sum of digit is a perfect square.

⇒ 22=2+2=4=2^2⇒63=6+3=9=3^2

⇒ 457=4+5+7=16=4^2

But

78=8+7=15

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