Permutations with repetitions
Permutations and combinations · Mathematics
Study notes
Q: How many distinct arrangements of the letters of (a) BANANA (b) MISSISSIPPI? (a) 6 letters, A x3, N x2: 6!/(3!2!) = 720/12 = 60. (b) 11 letters, I x4, S x4, P x2: 11!/(4!4!2!) = 39916800/1152 = 34650.