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100=2*2*5*5 so only 1 combination of 3 nos. r der
Just the one. The order of the numbers does not matter in a combination so that 123456 is the same combination as 245136.
120 WRONG! That is the number of PERMUTATIONS. In the case of combinations, the order of the numbers does not matter, so there is only 1 5-number combination from 5 numbers.
This question does not make sense since a combination is independent of the order of its elements. That is, the combinations 1245 and 5142 are the same. Consequently, there can be no "last " numbers in a combination.
about... 25 just take 5 numbers times 5 numbers