MBA Exam

4 letters and 4 envelope.... In how many ways can you put the letter such that none of them goes into the right envelope?Plz explain...

1) 9
2) 18
3) 24
4) 12
5) 16

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MBA Other Question
The street of a city are arranged like the lines of a chessboard , there are m street running north and south and n east and west . Find the no. ways in which a man can travel from N.W to the S.E corner, going by the shortest possible distance.please post the approach...

If n is an integer, how many values of n will give an integral value of ? 1. 22. 43. 84. 125. Infinite

1) 1
2) 2
3) 3
4) 4
5) 5