it C(n,8)=C(n,6),find C(n,2) Share with your friends Share 0 Manbar Singh answered this We have,C8n = C6n⇒n!n-8! × 8! = n!n-6! × 6!⇒1n-8! × 8×7×6! = 1n-6n-7 × 6!⇒n-6n-7 = 56⇒n2-13n+42 -56 = 0⇒n2-13n-14 = 0⇒n2-14n+n-14 = 0⇒nn-14+1n-14 = 0⇒n-14n+1 = 0⇒n - 14 = 0 or n + 1 = 0⇒n = 14 or n = -1 rejectedNow, C2n = C214 = 14!12! × 2! = 14×13×12!12! × 2×1 = 91 5 View Full Answer