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Permutations and Combinations
Question
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How many numbers can be formed by using digits 1, 2, 3, 4, 3, 2, 1 so that odd digits always occupy odd places?

Answer

Solution not provided.
Ans. 18

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Some More Questions From Permutations and Combinations Chapter

Determine K, so that K + 2, 4K – 6 and 3K – 2 are three consecutive terms of an A.P.