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#1

I cant get the logic of the above problem.I have tried many times.Please tell me the logic.

#2

Hi @Amit.sharma 1 is not a prime number, so it wont be counted as 1 is divisible by only 1. Same goes for 0, since it is not divisible by any number.
For every other number, it can be either prime or composite. If it is a prime number then it is divisible by itself, hence it should be counted. If it is a composite number, then you have to find its prime factorisation and search for factors < 20. If there exists such a factor, then you have to count it too.

#3

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