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n!/(n-4)!4! = n(n-2)
n(n-1)(n-2)(n-3)/4! = n(n-2)
n^2 -4n +3 = 4!
n^2 -4n +3-24 =0
n^2 -4n -21 = 0
(n-7)(n+3) = 0
n= 7 atau n=-3
karena faktorial tidaj boleh negatif maka pilih 7
mohon thanksnya dan brainliest answer nya -/\-