If a and b are both odd prime numbers and a < b, then how many different positive integer factors ...
If a and b are both odd prime numbers and a < b, then how many different positive integer factors does 2ab have?
Answer/Solution
8
Steps/Work
a and b are both odd prime numbers- It means either a or b is not 2
and since prime numbers have only two factors - 1 and the number itself
a and b each will have (1+1)= 2 factors
Hence 2ab will have (1+1)(1+1)(1+1)= 8 factors
D is the answer
and since prime numbers have only two factors - 1 and the number itself
a and b each will have (1+1)= 2 factors
Hence 2ab will have (1+1)(1+1)(1+1)= 8 factors
D is the answer