Answers

2015-01-23T13:43:15+05:30
10 letters; 4 places;
the required number of combinations is 10*9*8*7=5040;
Hence 5040 words with or without meaning can be obtained
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2015-01-23T15:04:02+05:30

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There are total 10 letters which are to be arranged in 4 places without repetition.
It can be done in 10P4 ways.

10P4 = 10!/(10-4)! = 10! / 6! = 7*8*9*10 = 5040
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