How many different 5-person subcommittees can be formed from a club having 10 members? a-30,240 b-504 c-2,520 d-252

Iwould say d..hope this

143 75 107 13 the answer

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.