Question

How many six digit number can be made from the digits 1, 1, 1, 2, 2, 3?

Answer 1

The permutation of all digits is
`6!`, but we don't differentiate the same digits, so we divide it by the number of permutations of 1's (
`3!`) and 2's (
`2!`)


`(6!)/(3!2!)=(4\cdot5\cdot6)/(2)=60`