Jawab:
3
Penjelasan dengan langkah-langkah:
(n+2)!/n! = 20
(n+2).(n+1).n!/n! = 20 coret n!
(n+2)(n+1) = 20
n²+ 3n + 2 = 20
n²+ 3n + 2 - 20=0
n²+ 3n -18 =0
(n+6)(n-3) = 0
n = - 6 atau n = 3
karena n bilangan asli maka n = 3
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Jawab:
3
Penjelasan dengan langkah-langkah:
(n+2)!/n! = 20
(n+2).(n+1).n!/n! = 20 coret n!
(n+2)(n+1) = 20
n²+ 3n + 2 = 20
n²+ 3n + 2 - 20=0
n²+ 3n -18 =0
(n+6)(n-3) = 0
n = - 6 atau n = 3
karena n bilangan asli maka n = 3