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OpenStudy (anonymous):
Stuck on this one: A deck of cards is shuffled and cards are dealt until a spade is dealt. If X is the number of cards until a spade is dealt, what is the probability that (3<=X<=8)? (w/o replacement)
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OpenStudy (anonymous):
I'm thinking 39C2*13/52C3 + 39C3*13/52C4+...39C7*13/52C8 but a) that's a ton of calcs and b) the sum is over 1. Anyone help with set up?
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