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The whole point of combinations is that the order of the number (or items) does not matter. Once you specify what the second number is, you are no longer looking at combinations.
720
137, 173, 317, 371, 713, 731 Six combinations can be made.
The number of combinations - not to be confused with the number of permutations - is 2*21 = 42.
Not sure what "multiple combinations means.There is only one 7-number combination and that is 1234567 or 1357642 or any one of the other permutations.
10,000 combinations.
If every number can be used as many times as you like, there are 104 = 10000 different combinations. If each number can only be used once, there are 9!/(9 - 4)! = 5040 combinations.
about 12
18 different combinations. When a coin is tossed twice there are four possible outcomes, (H,H), (H,T), (T,H) and (T,T) considering the order in which they appear (first or second). But if we are talking of combinations of the two individual events, then the order in which they come out is not considered. So for this case the number of combinations is three: (H,H), (H,T) and (T,T). For the case of tossing a die once there are six possible events. The number of different combinations when tossing a coin twice and a die once is: 3x6 = 18 different combinations.
Assuming a number can appear only once, there are 47C5 = 47*46*45*44*43/(5*4*3*2*1) = 1,533,939 combinations.
There is only one combination. The order of the digits in combinations makes no difference. They are considered as being different if they are permutations, not combinations.