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OpenStudy (ashtarothfick):
Can i have some help with this? In how many ways can 2 singers be selected from 4 who came to an audition? A. 6 B. 2 C. 12 D. 4 I think it's D.4
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OpenStudy (welshfella):
4C2 which means the number of combinations of 2 from 4. = 4*3 --- 2*1
OpenStudy (welshfella):
this is a quick way of working it out the full formula is nCr = n! ------ r! (n-r)!
OpenStudy (ashtarothfick):
How did you get the 3? @welshfella?
OpenStudy (ashtarothfick):
12/2= 6?
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