Question

Nilai n yang memenuhi persamaan 3n p2 = 30 adalah ...

Answer 1

#
3n P 2 = 30
<> (3n)! / (3n - 2)! = 30
<> (3n)(3n - 1)(3n - 2)! / (3n - 2)! = 30
<> (3n)(3n - 1) = 30
<> n(3n - 1) = 10
<> 3n² - n - 10 = 0
<> (3n + 5)(n - 2) = 0
<> n = 2