In how many ways can a student select three couses from seven available courses?

Answer 1

Isn't that just 7 choose 3 ??

Answer 2

Yeah.if we follow the rule of combination the ans comes 35 but the ans is showing 28..but how?

Answer 3

7!/[ 3! * 4! ]

7 * 6 * 5 / 3*2

35 all right