Ex 7.1,1 - Chapter 7 Class 11 Permutations and Combinations
Last updated at Jan. 30, 2020 by Teachoo
Transcript
Ex 7.1, 1 How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that (i) repetition of the digits is allowed? 3 digit number : Number of 3 digit numbers with repetition = 5 × 5 × 5 = 125 Ex 7.1, 1 How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that (ii) repetition of the digits is not allowed? 3 digit number : Number of 3 digit numbers without repetition = 5 × 4 × 3 = 60 1st digit 2nd digit 3rd digit
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.