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how many 4 digit numbers can be formed using the digits 1,2,3,4,5 such that 2 digits are repeated

how many 4 digit numbers can be formed using the digits 1,2,3,4,5 such that 2 digits are repeated

Grade:12

1 Answers

Sunil Raikwar
askIITians Faculty 45 Points
7 years ago
since 2 digits are repeated therefore we have to select 3 digits out of 5 & this can be done by 5c3 =10 ways now we can arrange these digits 4!/2!=12 so total no.=10x12=120.

Thanks & Regards
Sunil Raikwar
askIITians Faculty

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