Question

How many five-number combinations can be made from the following five numbers? 55111

Answer 1

use the formula :

n!/(a!b!)

here, n=5, a=2, b=3

Answer 2

im only should be 6th but they skipped me to the 9th grade this stuff is confusing to me

Answer 3

@RadEn

Answer 4

so you dont know about factorial ?
the other way is by manual, (but it too long for other case)

Answer 5

@RadEn no i just need help i thought it was 30

Answer 6

well, you can finish it.

it is 5!/(2!3!) = 5.4.3.2.1/(2.1.3.2.1) = 120/12 = ... ?