how many 5 numbers are in 1 to 90 like this 01,02,03,04,05 is one

Question

10,89,90,01,29 this is 5 numbers in one line, how many lines are in 1 to 90, I need list

Answer 1

There are 43,949,268 lines of 5 different numbers chosen out of the range 1 to 90.

This number is calculated by picking any number from 1 to 90. Having picked one number, there is a choice of 89 for the next, then 88 for the next, and so on. This gives a total of 90*89*88*87*86=5,273,912,160. So if the order is important, this is the answer (number of permutations). But if the order is not important, just the combination, this big number has to be divided by the number of ways 5 different numbers can be arranged, which is 120, giving us 43,949,268.