Find the numbers of 4-digit numbers that can be formed using the digits, 1,2,3,4,5 if no digit is repeated ? How many of these will be even?

Explanation

Here total number of digits = `5`


Number of digits used (no digit is repeated) = `4`


Number of permutations = `5_(P_4)`


=`120`

so, Now the units place can be filled with any one of the digits 2, 4 for even number.

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