Find the number of positive integers that are divisors of at least one of 10^{10},15^7,18^{11}.

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# Doubt from number theory

**Tushar_2019**#1

Okay I believe you can do it easily too.

See that we need to use the formula for set theory

How ?

A = no. of divisors of the first no.

B = no. of divisors of the 2nd no.

C = no. of divisors of the third no.

Now A intersection B will be the no. of divisors of the HCF of A and B

I guess you can solve from here.

If you need any more assistance then do tell

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**Tushar_2019**#5

Actually i had solved it , i posted it here so that others can try it.

BTW thanks @Mayank_2019_1 for solution

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