# Question: how many 6permutations of 15 have their digits listed in...

###### Question details

**How many 6-permutations of [15] have their digits listed
in increasing order? Show all your reasoning.**

(Note that, in the decimal system, digits are only the symbols 0,1,2,3,4,5,6,7,8 and 9. Therefore, to give an example of which 6-permutations you should be counting in this question, (1,2,4,5,7,8) should be among them, whereas (1,2,4,5,8,13) should not. In this question, 13 read as one-three rather than thirteen, so (1,2,4,5,8,13) is not increasing order. One correct increasing order example you need to count is (1,13,4,5,8,9))