bantu jawabb bsrta carany

1.a. 5C4 = 5!/(5-4)!.4!
= 5!/1!x4!
= 5x4!/4!
= 5
b. 7C5 = 7!/(7-5)!.5!
= 7x6x5!/5!x2!
= 7x3
= 21
c. 5C3 x 7C2/12C5
5C3 = 5!/(5-3)!.3! = 10
7C2 = 7!/(7-2)!.2! = 21
12C5 = 12!/(12-5)!.5! = 792
21 x 10/792
= 35/132
2. a.15C4 = 15!/(15-4)!.4! = 1.365
b. 50C3 = 50!/(50-3)!-3! = 19.600