15 choose 3 = 15!/(3!*(15-3)!)
= 15!/(3!*12!)
= (15*14*13)/(3*2)
= 5*7*13
= 455
Chat with our AI personalities
The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
8C6 = 28
9!/5! or 3024
None. You do not have enough numbers to make even one combination.
2 to the 7th power = 128 * * * * * No. That is the total number of combinations, consisting of any number of elements. The number of 2 number combinations is 7*6/2 = 21