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How man y positive integers less than 50 have an odd number of positiv

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How man y positive integers less than 50 have an odd number of positiv [#permalink] New post   02 May 2019, 09:31
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62% (01:32) correct 38% (01:42) wrong based on 76 sessions
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How man y positive integers less than 50 have an odd number of positive integer divisors?

(A) 3

(B) 5

(C) 7

(D) 9

(E) 11

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Re: How man y positive integers less than 50 have an odd number of positiv [#permalink] New post   02 May 2019, 12:44
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Only perfect squares have odd number of positive integer divisor. 1,4,9,16,25,36 and 49.

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Re: How man y positive integers less than 50 have an odd number of positiv [#permalink] New post   25 May 2019, 13:15
Can someone shed some light on this question?

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Re: How man y positive integers less than 50 have an odd number of positiv [#permalink]
25 May 2019, 13:15
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