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1/3
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1/3 Because if he requires 2 heads = $2, then it means he require HH out of {HH,HT ,TH,TT} We cannot consider TT because it would turn to zero. Therefore, he has 1 chance out of 3. Hence 1/3. Less
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Marchov chain with 2 and -1 absorbing OR geometric series 1/4^n from 1 to inf=1/3 Less
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Answer them all in the STAR method.
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((1/2) ^ 100 ) * ( 100! / ( 60! * 40 ! ) )
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It's more about your thought process, the types of investigating questions you ask, and how you approach the task rather than giving a 100% correct answer Less
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