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another question to add to that. With a starting hand of 7 cards, what are my chances of picking up red cards in that first hand of 7 cards. Also After having a set of 7 cards what are my chances of picking up a red after each turn that I draw a card?

2007-12-23 23:21:37 · 4 answers · asked by rara 1 in Science & Mathematics Mathematics

4 answers

The last bits of info are really vague.
% red = 22/61 * 100

If you want reds in the first 7, it's easier to start with the prob of getting all blues, then subtracting from 1.
P(7 blues) = 39/61 * 38/60 * 37/59 * 36/58 * 35/57 * 34/56 * 33/55
= 0.035
P(reds) = 0.965

*EDIT*
I got your email. Obviously I can't answer for every situation you're hinting at, but I can give you some general guidelines.
If at any point there are r red cards left, and n cards total left, then the probability of picking a red in your next draw is r/n.
e.g. suppose in your first 7 cards, you have 3 reds. That means there are 54 cards left, 19 are red. The prob that your 8th card is red is 19/54.
If the 8th card is red, then the 9th one is 18/53.
If the 8th card is blue, then the 9th has a 19/53 chance of being red.

And so on.

2007-12-23 23:29:19 · answer #1 · answered by Dr D 7 · 1 0

I have 61 cards in my deck. 22 are red, 39 are blue. Whats the percentage of picking up a red card?
= 22/61 * 100

2007-12-24 07:29:45 · answer #2 · answered by harry m 6 · 0 0

1.
22/61 x 100%
= 2200/61 %
= 36 4/61 %

2007-12-24 12:16:57 · answer #3 · answered by An ESL Learner 7 · 0 0

36.06%

2007-12-24 07:30:06 · answer #4 · answered by Λα✝†✝ωΩ 3 · 0 0

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