A probability problem by A Former Brilliant Member

Probability Level 2

How many numbers can be expressed as a product of 2 distinct 2 digit primes?


The answer is 210.

A Former Brilliant Member by A Former Brilliant Member

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1 solution

Number of 2 digit primes = 21

Number of numbers that can be expressed as the product of 2 distinct 2 digit primes

= ( 21 ) ( 21 − 1 ) 2 = \frac{(21)(21-1)}{2} = 210 = \boxed{210}

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