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A slip of paper is given to a person A who marks it either with a plus sign or a minus sign. Theprobability of his writing a plus sign is 1/3. A passes the slip to B, who may either leave italone or change the sign before passing it to C. Next C passes the slip to D after perhapschanging the sign. Finally D passes it to a referee after perhaps changing the sign. B, C, D eachchange the sign with probability 2/3.
Paragraph for Questions Nos. 45 to 46
A slip of paper is given to a person A who marks it either with a plus sign or a minus sign. Theprobability of his writing a plus sign is 1/3. A passes the slip to B, who may either leave italone or change the sign before passing it to C. Next C passes the slip to D after perhapschanging the sign. Finally D passes it to a referee after perhaps changing the sign. B, C, D eachchange the sign with probability 2/3.
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Question : 46
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