How many different numbers can be formed by taking one, two, three, and four digits from the digits 1, 2, 7, 8, if repetition are not allowed ?

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- October 29th 2009, 07:09 AMcreatively12Permutations without Repetition
How many different numbers can be formed by taking one, two, three, and four digits from the digits 1, 2, 7, 8, if repetition are not allowed ?

Please Help (Crying) - October 29th 2009, 07:14 AMcreatively12
I just tried this again, and i got the answer 64, am I correct ???

- October 29th 2009, 07:18 AMPlato
- October 29th 2009, 07:29 AMcreatively12
Thanks for the reply

so my answer is correct right ???