Three positive integers: 120.
8
6, as long as they are all different
Three.
Three numbers can be arranged in 27 different sequences if repetition is allowed, and in 6 different sequences if it's not.
5 different ways isn't it
add all the numbers together and divid by how many numbers you added
Since there are infinitely many prime numbers there are infinitely many sets of three prime numbers and so there are infinitely many products.
8
There are 22 such numbers.
6, as long as they are all different
Three.
Three numbers can be arranged in 27 different sequences if repetition is allowed, and in 6 different sequences if it's not.
1000
5 different ways isn't it
If the numbers can be repeated and the numbers are 0-9 then there are 1000 different combinations.
There are infinitely many rational numbers between any two (different) numbers, no matter how close together they are.
Since there are infinitely many primes, there are infinitely many numbers that are products of 3 primes.