Questions
Ten letters of an alphabet are given. Words with five letters are formed by these given letters. Then the number of words which have at least one letter repeated is
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a
69760
b
30240
c
99748
d
none of these
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Correct option is A
Number of five letter words that can be formed from 10 letters=10×10×10×10×10=105Number of five letter words that have none of their letter repeated=10P5=10×9×8×7×6=30240∴ Number of words which have at least one letter repeated=105−30240=69760Similar Questions
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
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