Combinations
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80k UsersThe number of words, with or without meaning, that can be formed by taking 4 letters at a time from the letters of the word 'SYLLABUS' such that two letters are distinct and two letters are alike.is ...... .
The given word ie 'SYLLABUS' having letters SS, LL,
ABUY.
Now, number of ways to select two like letters are .
And number of ways to select two distinct letters are
And number of ways to permutate the 2 like letters and 2 distinct letters is
So, number of required words
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