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21 July, 13:25

How many four digit numbers can be formed from the digits 1, 3, 5, 7 and 9 if no digit may be repeated in a number

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  1. 21 July, 16:44
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    Numbers: 1,2,4,5,7,8

    There are 4 digits __ __ __ __

    1st digit can be filled by any of the 6 numbers

    Similarly 2nd, 3rd and 4th

    Hence each digit will have 6 possibilities

    Therefore no. of 4 digit numbers that can be formed are 6 x 6 x 6 x 6 = 1296
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