Questions
If eight persons are to address a meeting then the number of ways in which a specified speaker is to speak before another specified speaker, is
detailed solution
Correct option is C
Let A, B be the corresponding speakers. Without any restriction the eight persons can be arranged among themselves in 8! ways, but the number of ways in which A speaks before B and the number of ways in which B speaks before A make up 8!. Also, number of ways in which A speaks before B is exactly same as the number of ways in which B speaks before A.∴ the required number of ways =12(8!)=20160.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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