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SELF DOUBT

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Deepanshu asked Nov 10, 2018
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TIFR2011-A-6 IN THIS QUESTION WE GET ANSWER 6 BY THIS METHOD . SIMPLE AND STRAIGHTOKK WHEN I APPLY THIS METHOD HERE Expectated no of coin toss THEN I GET X= 1/2 (X +1 ) ... ) + 1/2 (4 )Which makes X=6 but answer is 4 .where am i wrong
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