Which of the following cannot be
Question:

Which of the following cannot be a perfect square?

(a) 841  

(b) 529  

(c) 198  

(d) All of these

Solution:

(c) We know that, a number ending with digits 2, 3, 7 or 8 can never be a perfect square. So, 198 cannot be written in the form of a perfect square.

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