JEE MATHEMATICS MCQ: PERMUTATIONS

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In how many ways 3 letters can be posted in 4 letter-boxes, if all the letters are not posted in the same letter-box?

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Correct option: B

Option B (60) is correct because we subtract the cases where all letters are posted in the same box from the total possible ways of posting the letters.

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How many different nine digit numbers can be formed from the number 223355888 by rearranging its digits so that the odd digits occupy even positions? The number of ways in which

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\left( {m + n} \right)

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