How many 3 number combination can made from six numbers?

Answer 1

For repeating digits = 9 * 10 *10 = 900

For non-repeating digits = 9 * 9 * 8 = 728

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But it probably did not because it is wrong. The answer relates to the number of PERMUTATIONS which is quite different from COMBINATIONS. In a combination, the order of digits does not matter so that 123 is the same as 312 etc. Because the order of the digits is irrelevant, there can be no "leading" digit and so the absence or presence of 0s makes no difference.

Assuming the 6 numbers are all distinct, the answer is (6*5*4)/(3*2*1) = 20