What are the five number combinations out of 12345678?

Answer 1

There are 56 of them and they are:

12345, 12346, 12347, 12348, 12356, 12357, 12358, 12367, 12368, 12378,

12456, 12457, 12458, 12467, 12468, 12478, 12567, 12568, 12578, 12678,

13456, 13457, 13458, 13467, 13468, 13478, 13567, 13568, 13578, 13678,

14567, 14568, 14578, 14678, 15678, 23456, 23457, 23458, 23467, 23468,

23478, 23567, 23568, 23578, 23678, 24567, 24568, 24578, 24678, 25678,

34567, 34568, 34578, 34678, 35678, 45678.

Answer 2

There are 56 such combinations - too many to list.