(1) STATISTICS
In this word there are lo letters of which I is repeated 2 times. S is repeated 3 times and T is repeated 3 times.
Here, n = 10: p = 2; q = 3; r = 3
∴ Total permutation
(2) BOOKKEEPER
According to permutation of Identical things,
Total permutations = \(\frac{n!}{p!q!r!}\)
Here, n = 10; p = 3; q = 2; r = 2
∴ Total permutations
(3) APPEARING
There are 9 letters in this word of which A is repeated 2 times and P is repeated 2 times.
AccordIng to permutation of identical things.
Total permutations = \(\frac{n!}{p!q!}\)
Here, n = 9; p = 2; q = 2