Hasil dari 7P3 dan 6C3 . Dengan caranya

jawab

nPr = n ! / (n-r)!

7P3 = 7 ! / (7-3)!
=  7! / 4!
= (7.6.5.) 4!/4!
= 7.6.5
= 210

nCr = n! / (n-r)! . r!

6C3 = 6 ! / (6 -3)!. 3!
= 6 ! / (3! ; 3! )
= 6 .5.4. 3! /(3! . 3!)
= 6 . 5 .4 / (3!)
= 6 . 5 . 4 /  3. 2 . 1
= 5 . 4
= 10