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01 Jul 2018, 20:57
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The cards in a deck are numbered consecutively from 1 to 20. If some cards are red and some cards are black, what is the probability of drawing a red card?
(1) The odd-numbered cards are all red.
(2) The even-numbered cards are all black.
(1) The odd-numbered cards are all red.
(2) The even-numbered cards are all black.
01 Jul 2018, 23:30
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The cards in a deck are numbered consecutively from 1 to 20. If some cards are red and some cards are black, what is the probability of drawing a red card?
(1) The odd-numbered cards are all red.
But what about even-numbered cards. they all too could be red or only 2 of them or none of them
insuff
(2) The even-numbered cards are all black.
But what about odd-numbered cards. they all could be red or only 2 of them or none of them
insuff
combined
odd are red and even are black..
so probability is 50%
suff
C
(1) The odd-numbered cards are all red.
But what about even-numbered cards. they all too could be red or only 2 of them or none of them
insuff
(2) The even-numbered cards are all black.
But what about odd-numbered cards. they all could be red or only 2 of them or none of them
insuff
combined
odd are red and even are black..
so probability is 50%
suff
C
06 Jun 2026, 02:40
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In Data Sufficiency problems involving a set of objects (such as cards or marbles) numbered consecutively, does the absence of explicit information regarding the distribution of specific attributes (like color or suit) across those numbers allow for the possibility that some numbers are repeated, or should the default assumption be that each consecutive number appears exactly once?
