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Q.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?
Answers (8)
The five digits are 1, 2, 3, 4 and 5
As we know that repetition of the digits is not allowed,
so, the unit place can be filled by any of five digits.
Tens place can be filled with any of the remaining four digits.
Hundreds place can be filled with any of the remaining three digits.
Number of 3-digit numbers can be formed when repetition is not allowed
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