Question 392036
Two cards are drawn from a standard deck of cards .Find probability
P(both either black or an ace) = P(2 black) + P(2 ace) - P(2 black and 2 ace)
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P(2 black) = 26C2/52C2
P(2 aces) = 4C2/52C2
P(2black and 2 ace) 2C2/52C2
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So, P(both black or both aces) = {26C2+4C2-2C2]/52C2 
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= [325 + 6 -1]/1326
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= 330/1326
= 0.2489
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P(both jack or both face cards)
= [4C2 + 12C2 - 4C2]/1326
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= [6+66-6]/1326
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= 66/1326
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= 0.0498
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Cheers,
Stan H.