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How many odd integers from 1 to 200 (both inclusive) have odd number of factors?

A) 3
B) 4
C) 5
D) 6
E) Greater than 6

Answer: Option E

Integers having odd number of factors will be perfect squares. Odd numbers will have odd perfect squares. Thus, the possible values for the perfect squares are :

1,9,25,49,81,121,169 and the corresponding integers are 1,3,5,7,9,11,13 (more than 6). Thus E is the correct answer .

hi,
why arent you considering even squares like 4,36 etc..
4 has 1,2,4 as its factors
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GMATinsight
How many odd integers from 1 to 200 (both inclusive) have odd number of factors?

A) 3
B) 4
C) 5
D) 6
E) Greater than 6

Answer: Option E

Integers having odd number of factors will be perfect squares. Odd numbers will have odd perfect squares. Thus, the possible values for the perfect squares are :

1,9,25,49,81,121,169 and the corresponding integers are 1,3,5,7,9,11,13 (more than 6). Thus E is the correct answer .

hi,
why arent you considering even squares like 4,36 etc..
4 has 1,2,4 as its factors

Because the question asks about "odd integers" and not even or all integers
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Engr2012


Integers having odd number of factors will be perfect squares. Odd numbers will have odd perfect squares. Thus, the possible values for the perfect squares are :

1,9,25,49,81,121,169 and the corresponding integers are 1,3,5,7,9,11,13 (more than 6). Thus E is the correct answer .

hi,
why arent you considering even squares like 4,36 etc..
4 has 1,2,4 as its factors

Because the question asks about "odd integers" and not even or all integers

hi,
Sorry, did not read the Q properly :)
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chetan2u


Integers having odd number of factors will be perfect squares. Odd numbers will have odd perfect squares. Thus, the possible values for the perfect squares are :

1,9,25,49,81,121,169 and the corresponding integers are 1,3,5,7,9,11,13 (more than 6). Thus E is the correct answer .

hi,
why arent you considering even squares like 4,36 etc..
4 has 1,2,4 as its factors

Because the question asks about "odd integers" and not even or all integers

hi,
Sorry, did not read the Q properly :)

Finally, the Trap I laid out turned successful :P
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Finally, the Trap I laid out turned successful :P

Would've been a bigger trap if the last option would've mentioned a particular value rather >6
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hi,
Sorry, did not read the Q properly :)

Finally, the Trap I laid out turned successful :P
..


yeah, in a hurry but may be not in proper exam..
and although the answer was still correct because of choices, it could have easily been wrong.. :)
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hi,
Sorry, did not read the Q properly :)

Finally, the Trap I laid out turned successful :P
..


yeah, in a hurry but may be not in proper exam..
and although the answer was still correct because of choices, it could have easily been wrong.. :)

Changed option a little to make it a bigger trap :lol:
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