How many positive integers can be expressed ad a product of two or more of the prime numbers 5,7,11,and 13 if no one product is to include the same prime factor more than once?

11 positive integers can be expressed.

Step-by-step explanation:

Consider the provided information.

The number of possible prime numbers are 5,7,11,and 13.

There are 4 possible prime numbers.

How many positive integers can be expressed as a product of two or more of the prime numbers, that means there can be product of two numbers, three number or four numbers.

The formula to calculate combinations is:

The number of ways are:

Hence, 11 positive integers can be expressed.

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step-by-step explanation: