Q: How many 3 digits odd numbers can be formed from the digits 1 2 3 4 and 5 if repetition is not allowed?

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64 if repetition is allowed.24 if repetition is not allowed.

If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.

There are 2000 such numbers.

It is 415968.

Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77

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64 if repetition is allowed.24 if repetition is not allowed.

If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.

There are 2000 such numbers.

It is 415968.

There are 2000 such numbers.

Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77

9 odd numbers less than 100 can be formed. They are: 3,5,7,35,37,53,57,73 and 75.

125 There are five choices for each of the three digits (since repetition is allowed). So there are 5*5*5=125 combinations.

20 of them, if repetition is not allowed.

If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210

Just six numbers... 345, 354, 435, 453, 534 & 543

15 of them.