how many potential combinations of letters (out of 26) if 3 letters are used and none repeated?

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877

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What its the term to calculate how many variations are possible with a set of numbers. for example: 3 numbers has 6 possible combinations.

Guest Sep 16, 2016

Guest · Answer 1 · 2016-09-16T11:40:26

Permutation: A set of objects in which position (or order) is
important=nPr=26P3 =15,600

Combination: A set of objects in which position (or order) is NOT
important.=nCr=26C3 =2,600

geno3141 · Answer 2 · 2016-09-16T11:43:30

Combination: _nC_r = n! / [ (n - r)! · r! ]

If you assuming that only one number is chosen at a time, if there are n numbers, your answer will be n!.

ElectricPavlov · Answer 3 · 2016-09-17T12:33:04

26 x 25 x 24 = 15,600 combos