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

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

M MartinProfessorAsked on November 21, 2017 in GMAT.•1.1k views

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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.

IT Info WorldSupporterAnswered on November 21, 2017,

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