Permutations
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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
The sequence of six tails may begin at with the ith toss whereThus, the number of ways is
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If the letters of the word 'SACHIN' arranged in all possible ways and these words are written out as in dictionary, then the word SACHIN appears at serial number
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