Question

find how many 2 digit numbers can be formed from the digit 1 3 5 7 9 firstif repetitionof digit is not allowed in the same number second repeatation of digits is allowed

Answer 1

1. 13,31,35,53,37,73,39,93,15,51,17,71,19,91,57,75,79,97,59,95
2. 11,33,55,77,99 will be added to the first no.

Answer 2

13 15 17 19 31 51 71 91 57 79 37 so on.



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