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Total number of 2-digit numbers = (99 - 9) = 90 of them

Every number that isn't a perfect square has an even number of factors.

2-digit numbers that are perfect squares: 16, 25, 36, 49, 64, and 81 = 6 of them

Remaining 2-digit numbers = (99 - 6) = 93 .

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Q: How many 2 digit numbers have even no of factors?
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