Hello, robocop_911!

Sorry, your answers are wrong . . .

(a) How many different strings can be formed by rearranging all the letters

of the wordMISSISSAUGA?

There are 11 letters: .

There are: . possible strings.

(b) How many of the rearrangements in part (a) contain 4 S’s in a row?

Tape the four S's together.

Then we have 8 "letters" to arrange: .

There are: . arrangements.