1 combination comprising 0 numbers,6 combinations comprising 1 numbers,
15 combinations comprising 2 numbers,
20 combinations comprising 3 numbers,
15 combinations comprising 4 numbers,
6 combinations comprising 5 numbers,
1 combination comprising 6 numbers.
64 combinations in all.
There are 16C4 = 16*15*14*13/(4*3*2*1) = 1820 combinations.
Assuming that "number" means digits and that it is permutations (rather than combinations) that are required, the answer is 816 which is 281.475 trillion (approx).
If order matters and a number cannot be repeated, then there are 16x15x14x13 = 43680 different combinations. If order does not matter then you must divide by the number of ways you can rearrage the same 4 numbers i.e. divide by 4x3x2x1=24 so you can select 4 numbers from a group of 16 in 43680/24 = 1820 ways. In mathematical terms there are 43680 permutations of 16 numbers taken 4 at a time and 1820 combinations of 16 number taken 4 at a time.
252 combinations, :)
The number of combinations is 10C4 = 10*9*8*7/(4*3*2*1) = 210
There are 16C4 = 16*15*14*13/(4*3*2*1) = 1820 combinations.
This question needs clarificatioh. There are 4 one digit number combinations, 16 two digit combinations, ... 4 raised to the n power for n digit combinations.
Assuming that "number" means digits and that it is permutations (rather than combinations) that are required, the answer is 816 which is 281.475 trillion (approx).
There are about 8 million possibilities for the gametes.
There are 18*17*16/6 = 816 of them!
Assuming there are 5 check boxes and the respondent may check any number of them, the answer is 24 = 16 combinations.
4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.
If order matters and a number cannot be repeated, then there are 16x15x14x13 = 43680 different combinations. If order does not matter then you must divide by the number of ways you can rearrage the same 4 numbers i.e. divide by 4x3x2x1=24 so you can select 4 numbers from a group of 16 in 43680/24 = 1820 ways. In mathematical terms there are 43680 permutations of 16 numbers taken 4 at a time and 1820 combinations of 16 number taken 4 at a time.
The number of combinations is 20C5 = 20!/(15!*5!) = 20*19*18*17*16/(5*4*3*2*1) = 15,504
16
There are 18C4 = 18!/[18-4)!4!] = 18*17*16*15/(4*3*2*1) = 3060 combinations.
The number of combinations of 6 letters is 6! or 720.