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teachoo.com
Ex 6.4, 1 - If nC8 = nC2, find nC2 - Binomials Class 11 - Ex 6.4
Ex 6.4, 1If nC8 = nC2, find nC2 .Given nC8 = nC2 If nCr = nCp then either r = p or r = n – pThus, nC8 = nC2 8 = n – 2 8 2 = n 10 = n n = 10Calculating nC2 Putting n = 10 10C2 = 10!/2!(10 − 2)! = 𝟏𝟎!/(𝟐! 𝟖!) = (10 × 9 × 8!)/((2 × 1)× 8!) = (10 × 9
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