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Ex 7.2, 5 - Evaluate n!/(n-r)! , when n = 6, r = 2 - Class 11

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Ex 7.2, 5 Evaluate n!/(n − r)! , when n = 6, r = 2 n!/(n − r)! Putting n = 6 & r = 2 = 6!/(6 − 2)! = 6!/4! = (6 × 5 × 4!)/4! = 6 × 5 = 30

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.