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In musical chair game, a person has been advised to stop playing music at any time within 40 sec after its start, what is the probability that music w

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In musical chair game, a person has been advised to stop playing music at any time within 40 sec after its start, what is the probability that music will stop within first 15 seconds.
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It is given that music will stop after `40` seconds for sure.
Therefore, probability that music will stop after `15` seconds ` = 15/40 = 3/8.`
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