Question

How many ways a 4 digits numbers can be formed using 0,1,2,3

Answer 1

9...,......................

Answer 2

Total 24 numbers can be formed without repeating a digit.

let our four digit number be W X Y Z .

Here we have 4 options for filling W as no digit is getting repeated.

Now, we have only 3 number for filling X as one of the digit has been taken by X.

Now, we have only 2 number for filling Y as two digits are taken by X and Y.

Finally we have only 1 number left for filling Z as rest three numbers are taken by W, X and Y .

So our required number of solution will be 4*3*2*1 = 24

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