Permutations
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80k UsersThe number of words which can be formed out of the letters of the word ARTICLE, so that vowels occupy the even place is
In a word ARTICLE, vowels are A, E, I and consonants are C, L, R, T.
In a seven letter word, there are three even places in which three vowels are placed in 3! way. In rest of the
four places, four consonants are placed in 4! ways.
.'. Required number of ways =
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The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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