Answer :

In the question, we have to find the possible number of 4 digit numbers formed by the numbers 3, 5, 6, 9 when repetition of digits is not allowed.

We will use the concept of multiplication because there are four sub jobs dependent on each other because a number appearing on any one place will not appear in any other place because ** all the four numbers are to be used as they are in the code**.

The first position from the left will have four choices; the second position will have three choices because one number is consumed in the first position , the number of choices will decrease by one as we keep on going right side.

The number of ways in which we can form four-digit numbers with the help of given data is 4 × 3 × 2 × 1 = 24

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