Question

The first ten letters of the alphabet are to be placed in a line, find the number of arrangements possible of A and B are together and the C,D, and F are not

Answer 1

| A | B | | | | | | | | |
first, find the number arrangements the event of A and B are together

Answer 2

ok 18 then what?

Answer 3

the 3 letters C,D and F can then be arranged in the 8 places left in 8P3 ways
that is the number of permutations of 3 letters in 8.

Answer 4

8P3 = 8! / (8 - 3)!

Answer 5

so possible arrangements = 18 * (8! / 5!)

Answer 6

are you familiar with 8! ( 8 factorial)

Answer 7

u still there?