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June 25th, 2008, 03:19 PM  #1 
Senior Member

Help with math
For a class a friend is taking. License plates.
2 number and 4 letters. 3 numbers and 3 letters. How to figure out how many combinations are possible. Thanks, ElDeeDer Last edited by ElDeeder; June 25th, 2008 at 03:24 PM. 
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June 25th, 2008, 03:26 PM  #5 
r00t4r3d

2 Number and 4 Letter combo:
10 x 10 x 26 x 26 x 26 x 26* 3 Num 3 Letter: 10 x 10 x 10 x 26 x 26 x 26* *If letters and numbers can be used more than once. imho.... Go with BigCountry in 4/4=4 
June 25th, 2008, 03:30 PM  #9 
r00t4r3d


June 25th, 2008, 03:31 PM  #10 
KD8GKB

Calculating combinations and permutations
combinations (nCk) Click in an unoccupied cell, for example C4. Then type =combin(your nvalue, your kvalue), i.e. "10 choose 6" would be =combin(10,6). The number of combinations will appear in the C4 box. It should be 210. permutations (nPk) Click in an unoccupied cell, for example C5. Then type =permut(your nvalue, your kvalue), i.e. 9 P 5 would be =permut(9,5). The number of permutations will appear in the C5 box. It should be 15120. excel for the win. 
June 25th, 2008, 03:45 PM  #13 
Senior Member

Lothos,
When I put =combin(10,26) in the box i get #num! 10 being 09 26 being 26 letters in the alphabet. Am i not following something or am i missing something. Thanks for the help. 
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