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18 Jan 2019, 00:50
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A certain jar contains 21 marbles, 7 of which are red. If two marbles are to be selected, with replacement, what is the probability that both marbles will be red?
A 1/9
B 1/6
C 1/3
D 2/3
E 3/4
A 1/9
B 1/6
C 1/3
D 2/3
E 3/4
18 Jan 2019, 04:52
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A certain jar contains 21 marbles, 7 of which are red. If two marbles are to be selected, with replacement, what is the probability that both marbles will be red?
No. of ways of selecting 2 red marbles = 7* 7
No. of way of selecting any 2 marbles = 21*21
Probability of selecting 2 marbles = 7*7/21*21 = 1/9
Answer A
No. of ways of selecting 2 red marbles = 7* 7
No. of way of selecting any 2 marbles = 21*21
Probability of selecting 2 marbles = 7*7/21*21 = 1/9
Answer A
18 Jan 2019, 07:19
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Bunuel
A certain jar contains 21 marbles, 7 of which are red. If two marbles are to be selected, with replacement, what is the probability that both marbles will be red?
A 1/9
B 1/6
C 1/3
D 2/3
E 3/4
A 1/9
B 1/6
C 1/3
D 2/3
E 3/4
7/21 * 7/21 = 1/9
IMO A
