Can anyone check if my below given questions answer is correct or not...

(a) How many different strings can be formed by rearranging all the letters of the wordMISSISSAUGA? Briefly justify your answer.

my ans)9!

(b) How many of the rearrangements in part (a) contain 4 S’s in a row? Briefly justify your answer.

my ans) Permutation(8,4)

Thanks for the help!