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17 Oct 2019, 00:43
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C
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15 marbles are placed in a bowl; some are red, and some are blue. If the number of red marbles is 1 more than the number of blue marbles, what is the probability that a marble taken from the bowl is blue?
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
firas92
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17 Oct 2019, 00:46
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Since the number of red marbles is 1 more than the number of blue marbles,
Red = 8
Blue = 7
Probability of drawing blue marble = 7/15
Answer is (C)
Red = 8
Blue = 7
Probability of drawing blue marble = 7/15
Answer is (C)
17 Oct 2019, 10:17
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Bunuel
15 marbles are placed in a bowl; some are red, and some are blue. If the number of red marbles is 1 more than the number of blue marbles, what is the probability that a marble taken from the bowl is blue?
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
given total balls red+blue = 15
x+x+1=15
x=7 ; blue
red = 8
so P of blue ball ; 7/15
IMO C
