[JEE Advanced 1982] from 10 different letters five letter words are formed the number of words having
From $10$ different letters, five-letter words are formed. The number of words having at least one letter repeated is
(a) $69760$
(b) $30240$
(c) $99748$
(d) none of these
1 Answer
VAVidaara Admin
✓ Vidaara Team
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· 2d ago
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Correct answer: (a) $69760$
Total $10^5=100000$ minus all-distinct $10\cdot9\cdot8\cdot7\cdot6=30240$ gives $69760$.
JEE Advanced 1982 · Permutations and Combinations — verified solution by the Vidaara Team.
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