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n !/ (n-2)! 2! = 105
n(n-1)(n-2)! /(n-2)! = 2(105)
n(n-1) = 210 = 15(14)
n = 15
b. nC4 = nC3 , dgn syarat n > 4 atau n> 3 , maka n > 4
n!/(n-4)! 4! = n !/ (n-3)! 3!
(n-3)! / (n-4) ! = 4 ! n ! / n!. 3!
(n-3)(n-4)! /(n-4)! = 4 3!/3!
n - 3= 4
n = 7
c. nC 2 = 100 C 98
n ! / (n-2)! 2! = 100 !/ (100-98)! - 98 !
n (n-1) = 2! . 100. 99 / 2!
n(n-1) = 100(99)
n = 100