6P4 = 6!/(6-4)! = 6 * 5 * 4 * 3 = 360 four letter permutations from 6 different letters.
6C4 = 6!/[4!∙(6-4)!] = 15 four letter combinationsfrom 6 different letters.
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As there are 26 letters in the alphabet. You can calculate the number of combinations by multiplying 26x26x26, giving you the answer 17576.
Assuming you are using the standard English alphabet, the number of combinations you can make are: 26 x 26 = 676 combinations.
The question contradicts itself. The order of the letters is irrelevant in a combination [though it does matter in a permutation]. So what is it that you are asking for? Combinations or order-dependent arrangements?
you cam make 36 different combinations.Ans 2.If you roll one dice twice, there are 36 combinations, if and only if you count 1,2 as different from 2,1.If you are rolling two dice (at once) there are only 21 different combinations !
There are 26! (which means 26*25*24 all the way to 1) permutations. this comes to 403,291,461,100,000,000,000,000,000 different combinations. If it takes you thirty seconds to write out one combination, then it would take 383,123,823,100,000,000,000 YEARS to write all the combinations. To put this into context, the universe (and possibly time itself) is only 13,700,000,000 years old.