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In a jar of 8 marbles, 3 are red. If you choose two marbles at random
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18 Apr 2022, 01:00
18 Apr 2022, 01:00
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Question Stats:
95% (00:44) correct
5% (00:33) wrong based on 20 sessions
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In a jar of 8 marbles, 3 are red. If you choose two marbles at random from the jar without replacement, what is the probability that both selections are red?
(A) 3/32
(B) 3/28
(C) 9/64
(D) 1/4
(E) 3/8
(A) 3/32
(B) 3/28
(C) 9/64
(D) 1/4
(E) 3/8
Part of the project: Skill Builder Project for a Q170
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GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
Re: In a jar of 8 marbles, 3 are red. If you choose two marbles at random
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27 Apr 2022, 22:10
27 Apr 2022, 22:10
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Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
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Re: In a jar of 8 marbles, 3 are red. If you choose two marbles at random
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29 Apr 2022, 06:58
29 Apr 2022, 06:58
1
Carcass wrote:
In a jar of 8 marbles, 3 are red. If you choose two marbles at random from the jar without replacement, what is the probability that both selections are red?
(A) 3/32
(B) 3/28
(C) 9/64
(D) 1/4
(E) 3/8
(A) 3/32
(B) 3/28
(C) 9/64
(D) 1/4
(E) 3/8
P(both marbles are red) = P(1st marble is red AND 2nd marble is red)
= P(1st marble is red) x P(2nd marble is red)
= 3/8 x 2/7
= 6/56
= 3/28
Answer: B
