On a calculator:
43C5 = 962598
This is for combinations and not permutations, so in essence, the order of the 5 number combinations does not matter.
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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
No. The number of permutations or combinations of 0 objects out of n is always 1. The number of permutations or combinations of 1 object out of n is always n. Otherwise, yes.
There are 5,461,512 such combinations.
There are infinitely many numbers and so infinitely many possible combinations.
The number of combinations - not to be confused with the number of permutations - is 2*21 = 42.