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4p3*3p1 equal to 72 ways

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Q: How many 4 digit odd numbers can you make using numbers 1 to 5 without repeating?

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24680

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The answer is 3*3*2*1 = 18. If the leading digit is 0 it is not a 4-digit number.

502 205 250 520 4 numbers. If a leading zero is allowed then you can have 052 and 025 for 6 numbers.

10 x 9 x 8 = 720.

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24680

There are 840 4-digit combinations without repeating any digit in the combinations.

24

18, if leading 0s are disallowed.

93,876

468, 486, 648, 684, 846, 864.

The answer is 3*3*2*1 = 18. If the leading digit is 0 it is not a 4-digit number.

502 205 250 520 4 numbers. If a leading zero is allowed then you can have 052 and 025 for 6 numbers.

10 x 9 x 8 = 720.

Six of them.

There are twelve possible solutions using the rule you stated.

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