PERMUTATIONS & COMBINATIONS
122. The number of four letter words that can
be formed using the letters of the word
BARRACK is
(JEE Online-2018)
1) 144 2) 120 3) 264 4) 270
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Answer: 4) 270
Step-by-step explanation: Take the cases and add them,
∴ number of four-letter words that can be formed=120+72+72+6=270
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