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n! / 4!(n - 4)! = n! / (n - 3)!
kali silang, n! dicoret
4!(n - 4)! = (n - 3)!
(n - 4)! dicoret
4! = n - 3
24 = n - 3
n = 27
2.
8C5
= 8! / 5!(8 - 5)!
= 8! / 5!×3!
= (8 × 7 × 6) / (3 × 2 × 1)
= 8 × 7
= 56 pilihan
semoga benar yaa... ;-)