There are 4845 combinations of 4 numbers from 20.
They are:
{1, 2, 3, 4}, {1, 2, 3, 5}, {1, 2, 3, 6}, {1, 2, 3, 7}, {1, 2, 3, 8},
{1, 2, 3, 9}, {1, 2, 3, 10}, {1, 2, 3, 11}, {1, 2, 3, 12}, {1, 2, 3, 13},
{1, 2, 3, 14}, {1, 2, 3, 15}, {1, 2, 3, 16}, {1, 2, 3, 17}, {1, 2, 3, 18},
{1, 2, 3, 19}, {1, 2, 3, 20}, {1, 2, 4, 5}, {1, 2, 4, 6}, {1, 2, 4, 7}, ...
I'll leave the other 4825 combinations for you to list.
20
two
14 * * * * * Wrong! There are 15. 4 combinations of 1 number, 6 combinations of 2 number, 4 combinations of 3 numbers, and 1 combination of 4 numbers.
There are 4845 combinations of 4 numbers from the set 1 - 20 nCr = n!/r!(n-r)! ⇒ 20C4 = 20!/4!(20-4)! = 20 x 19 x 18 x 17/4 x 3 x 2 x 1 = 4845
4!=4x3x2x1=24
how many combinations of 4 numbers are there in 7 numbers
How many combinations of five. Numbers could you get from 1 to 20
10 * * * * * That is just plain wrong! It depends on how many numbers in each combination but there are 1 combination of 4 numbers out of 4, 4 combinations of 3 numbers out of 4, 6 combinations of 2 numbers out of 4, 4 combinations of 1 number out of 4. A grand total of 15 (= 24-1) combinations.
20
20
16
You would get 4!/2! = 12 combinations.
There are 4845 combinations.
7
8C4 = 70
two
it is hard to say there are lot of combinations belive or not * * * * * If the previous answerer thinks 15 is a lot then true. There are 1 combination of 4 numbers out of 4, 4 combinations of 3 numbers out of 4, 6 combinations of 2 numbers out of 4, 4 combinations of 1 number out of 4. A grand total of 15 (= 24-1) combinations. Not so hard to say!