RE: Find out which of the following number is not a perfect square.

a. 2187
b. 78125
c. 16284
d. 3125
e. None of the above

M Martin Brong Asked on November 21, 2017 in GMAT.
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1 Answers

Thanks for asking question on GMAT Section,

Your question was – Find out which of the following number is not a perfect square.

Your correct answer is- A

Now read this explanation for more clarifications:

According to the standard properties of square numbers, all perfect square numbers must end in either 0, 1, 4, 5, 6 or 9.
Now, looking at the given options, we find that options b, c and d have 4 and 5 as the digit in the unit’s place.
Hence, these numbers belong to the set of perfect squares.
Thus, we are left only with the option a. this number has 7 as the digit in the unit’s place.
Hence, it 2187 is not a perfect square.
Hence, the correct answer is option a.

Silver Answered on November 21, 2017.
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