A pack of cards has one card misssing.Two cards are drawn randomly and are found to be spades.The probability that the missing card is not a spade, is
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a
34
b
52867
c
22425
d
3950
answer is D.
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Detailed Solution
Suppose that E be the event of loosing card not spade, and A be the event of getting both cards drawn are spade. Let E be the even of Lost card is not spadeA be the event of getting cards drawn are spadePE=3952=34PAE=C13,2C51,2=13⋅1251⋅50,PAEc=C12,2C51,2PEA=PAEPEPAEPE+PAEcPEc=34⋅13⋅1251⋅5034⋅13⋅1251⋅50+14⋅12⋅1151⋅50=3⋅13⋅123⋅13⋅12+1⋅12⋅11=3939+11=3950