Question

In how many ways we can arrange the four letters of the word 'SERIES' ?

Answer 1

For first letter, we have 5 choices ( counting E once )
so 5!=120

Answer 2

not exactly sure

Answer 3

it would be 5! divided by 2! (for the S's), then divided by 2! again (for the E's)

Answer 4

Out of 6 letter of the word SERIES we have to select 4 letter at a time only.
Example when all the four letters are different = 4! =24
when 2 are same and 2 are different = 4!/2! = 12
when letters are of one type other two are of other type = 4!/(2! * 2!) = 6 example 'SSEE'
Total number of arrangement = 24 +12 + 6 = 42

But in book the answer given is 102