Number of ways of writing a number as a product of two co primes
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Formula 1: The number of factors of a number
Formula 2: The sum of factors of a number
Formula 3: The number of ways of writing a number as a product of two number
Example: Find the number of co-primes to 144 which are less than that of it
Ans: The prime factorization of 144 = 24×3224×32
The number of co-primes which are less than that of 144 = 144×(1−12)×(1−13)144×(1−12)×(1−13) = 48
hope it hepls you.....
Formula 2: The sum of factors of a number
Formula 3: The number of ways of writing a number as a product of two number
Example: Find the number of co-primes to 144 which are less than that of it
Ans: The prime factorization of 144 = 24×3224×32
The number of co-primes which are less than that of 144 = 144×(1−12)×(1−13)144×(1−12)×(1−13) = 48
hope it hepls you.....
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