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07/09/2017 at 15:49

How many positive integers less than or equal to 100 have the same number of odd factors as even factors?

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Lê Quốc Trần Anh Coordinator 07/09/2017 at 20:45

There are no numbers satisfy the question from 0-9 or number 100

There are 5 numbers a tenth-row (10s ; 20s ; ... ; 90s) numbers satisfy the question from 10-99. Because there are 9 tenth-row from 10-99 and there are no numbers from 0-9 or 100 => There are: \(9\cdot5=45\left(numbers\right)\) satisfy the question.

ANSWER: 45 numbers
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hochiminh 07/09/2017 at 19:52

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