If you don't repeat them, you can get up to six different combinations.
9
Egyptians made the number 2 back in B.C
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 four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
59
The number of combinations is 39*38*37*36*35 / (5*4*3*2*1) = 575757
It depends on how many numbers are in each combination. If there are 5 numbers in each combination, then you have 575,757 possibilities. If there are 2 in each combination, there you have 741 possibilities. If there's only 1 number in each combination, then there are only 39 possibilities.
The number 34.5 can be written as a fraction in many different ways. One of them is 34 1/2. This is a combination of whole number and fraction. You could also write it as 69/2.
Total of the number produced is 22 789
There are two choices (number 2 or number 3) for each of the five digits. The number of combinations is therefore, 2 x 2 x 2 x 2 x 2 = 32
10 000 * * * * * NO! That is the number of PERMUTATIONS, not COMBINATIONS. In a combination, the order does not matter so that 1234 is the same as 1432 or 3412 etc. Assuming the 4 numbers are different, the correct answer is 15 comprising 4 1-digit combinations, 6 2-digit combinations, 4 3-digit combinations and 1 4-digit combination. Another way to look at it is that the first number can be in a combination or not. With each of these possibilities, the second can be in or out - giving 2*2 = 4 ways so far. With each of these there are two options for the third giving 2*2*2 = 8 combinations so far and then the last number makes it 2*2*2*2 = 16. But one of these combinations contains none of the numbers - each one is not in. Leaving that one out gives the answer 15. In general, the number of combinations of any size, from n distinct objects is 2n and if you exclude the null combination, it is 2n - 1.
six out of seven... the only one which didnt reach number 1 was Blackout, which only reached to number 2