There are 10 letters in the word BASKETBALL. However, we will look at the number of unique arrangements of "BASKETBAL" with just 1 "L". Then we can add another "L" in each unique arrangement of "BASKETBAL" to get a unique arrangement of "BASKETBALL" with 2 L's together.

"BASKETBAL" has 9 letters.

9! = 9 × 8 × 7 ... × 2 × 1 = 362,880 ways to arrange those letters.

B's and A's are repeated in the arrangement.

9! / (2!)*(2!) = 362,880/4 = **90,720 permutations**

Vinu P.

thank you for your explanation!08/25/20