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
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
To calculate the number of 4-number combinations from 1 to 20, we can use the formula for combinations, which is nCr = n! / (r!(n-r)!), where n is the total number of items and r is the number of items to choose. In this case, n = 20 and r = 4. Plugging these values into the formula, we get 20C4 = 20! / (4!(20-4)!) = 4845. Therefore, there are 4845 different 4-number combinations possible from the numbers 1 to 20.
16
Oh, isn't that a happy little question? Let's see here... To find the number of combinations of 4 numbers out of 7, we can use a simple formula: 7 choose 4, which is calculated as 7! / (4! * (7-4)!). So, there are 35 unique combinations of 4 numbers that can be made from a set of 7 numbers. Isn't that just delightful?
two
7
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.
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!
4+4+4+4+4= 20
20 There can be two answers to this: I'll assume this is what you meant-> let's say you mean like pairing the numbers 1-5 with the numbers 6-9. 5*4=20