2, 3, 5, 10, 12
if m and n are integers in the list above and m

Question

2, 3, 5, 10, 12
if m and n are integers in the list above and m<n, how many different ordered pairs (m,n) can be formed such that the product mn is even?

anonymous · Answer

{(2,3), (2,5), (2,10), (2,12), (3,10), (3,12), (5,10), (5,12), (10,12)}
= 9 pairs

anonymous · Answer

thanks but is there any way i can use an equation to solve this?

anonymous · Answer

I don't believe so, but there are some things you can notice:
1) If m is an even number, it will form a pair with any number (even * even or odd = even)
2) If n is an even number, it will form a pair with any number
3) If m is odd, it will form a pair with ONLY even numbers

anonymous · Answer

ok thank you again

anonymous · Answer

No problem!