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Earn +20 ptsQ: How many Combinations of 3 with 20 choices?
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How many combinations of 3 numbers are there in 23 numbers?
There are 23C3 = 23!/(20!*3!) = 23*22*21/(3*2*1) = 1,771 combinations.
How many 3 digit combinations are there in 1 to 21?
I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.
How many 3 number combinations are there from 0-9 and the numbers cannot repeat?
There are 10 choices for the first number, 9 for the second and 8 for the third. 10*9*8=720 possible combinations.
What 3 numbers add up to 60?
63
How many combinations of 1 2 3 is there in 6 runners?
If their sequence matters . . . 120 If it doesn't . . . 20
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