Hitunglah C (7,4) dan c (8,4)

Bab Permutasi Kombinasi
Matematika SMA Kelas X

1] 7C4 = (7 x 6 x 5 x 4) : (4 x 3 x 2 x 1)
           = 35

2] 8C4 = (8 x 7 x 6 x 5) : (4 x 3 x 2 x 1)           
            = 70

Mapel       : Peminatan Matematika 
Kategori   : Peluang
Kelas        : SMP / MTs kelas XI
Semester : Ganjil


Pembahasan:
[tex]_7C_4 = \frac{7!}{4!3!} [/tex]
[tex]_7C_4 = \frac{(7 (6)(5)(4)(3)(2)(1))}{(4(3)(2)(1))(3(2)(1))}[/tex]
[tex]_7C_4 = 35[/tex]

[tex]_8C_4 = \frac{8!}{4!4!} [/tex]
[tex]_8C_4 = \frac{(8(7)(6)(5)(4)(3)(2)(1))}{(4(3)(2)(1))(4(3)(2)(1))}[/tex]
[tex]_8C_4 = 70[/tex]