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1.
a. 6! = 6 . 5 . 4 . 3 . 2 . 1 = 720
b. (13 - 9)! = 4! = 4 . 3 . 2 . 1 = 24
c. 7! + 3! = 7 . 6 . 5 . 4 . 3 . 2 . 1 + 3 . 2 . 1 = 5040 + 6 = 5046
2.
a. 9!/7! = 9 . 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1/ 7 . 6 . 5 . 4 . 3 . 2 . 1 = 9. 8 = 72
b. 10! - 9!/8! = (10 . 9 . 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1 - 9 . 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1)/ 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1
= 9 . 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1(10 - 1)/8 . 7 . 6 . 5 . 4 . 3 . 2 . 1
= 9 . 9 = 81
3.
a. 8 . 7 . 6 = 8!/5!
b. 12 . 11 . 10 . 9 = 12!/8!
4.
a. a! - b! = 8! - 5! = 8 . 7 . 6 . 5 . 4 . 3 . 2 . 1 - 5 . 4 . 3 . 2 . 1 = 40320 - 120 = 40200
b. (a - 2)! + (b + 1)! = 6! + 6! = 6 . 5 . 4 . 3 . 2 . 1 + 6 . 5 . 4 . 3 . 2 . 1 = 720 + 720 = 1440
5.
a. n! / (n - 2)! = 6
=> n . (n - 1) . (n - 2) . (n - 3) ...../(n - 2) . (n - 3) ..... = 6
=> n (n - 1) = 6
=> n² - n = 6
=> n² - n - 6 = 0
=> (n - 3)(n + 2) = 0
n = 3 (mungkin) atau n = -2 (tidak mungkin)