Puzzle of the day: 96
In the first 100 natural numbers, how many numbers have even number of factors?
- 10
- 90
- 50
- 80
In the first 100 natural numbers, how many numbers have even number of factors?
Sol Only perfect squares have odd number of factors Hence there 10 numbers in first 100 natural numbers that have odd number of factors, Rest 90 numbers have even number of factors.
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