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That's a supply of 5 digits . . . 2, 3, 4, 5, and 6.
If the order of the four makes a difference, then there are (5 x 4 x 3 x 2) = 120 ways
to select and arrange 4 out of the 5 digits.
If the order doesn't matter, and you just want to know how many different groups of 4
can be selected out of the 5 you have, then there are only 5 of those.
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How many 2 number combinations can be made out of 7 numbers?
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
How many 2 number combinations are there in the numbers 1 to 9?
There are 9C2 = 9*8/(2*1) = 36 2-digit combinations.
How many numbers can you make with 3 7 8 9?
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.
What 2 numbers multiply 36?
72
How many number combinations are there if there are six numbers and you have to have a four number combination?
all numbers have to be different 720 360 (6*5*4*3*2*1), * * * * * Wrong. Combinations do not have to be different. Those are permutations. There are only 6C4 = 6*5/(2*1) = 15 combinations.
