How many ways can be letters { 5.a. 4.b, 1.c} be arranged so that all letters of same kind are in a single block
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Number of ways of selecting 3 different letters
Number of ways to select 1 similar and 2 different letter:
Number of ways of selecting 1 similar + 1 more similar letter and 1 different letter:
Number of ways to select 2 similar and 1 different letter:
ways of selecting 3 similar letters:
1
total ways: