Questions
The number of ways of permuting letters of the word so that none of the letters occurs in the last five positions is
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a
5!
b
2(5!)
c
7(5!)
d
21(5!)
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Correct option is B
Letters of the word ENDEANOEL are3E′s,2N′s,1D,1O,1L,1ALetters D, L, N can be permuted at first 4 places in 4!2! waysand the remaining letters can be permuted 5!3! ways.∴ required number of ways 4!2!×5!3!=2(5!)Similar 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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