The number of words, with or without meaning,

Question:

The 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_________.

Solution:

$\mathrm{S}_{2} \mathrm{YL}_{2} \mathrm{ABU}$

ABCC type words

$=240$

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