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A jar contains g green marbles and r red marbles. If 2 green and 14 re

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A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 16 Feb 2017, 03:39
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A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)
Spoiler: OA

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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 16 Feb 2017, 04:17
probability of choosing some green marble: Total number of ending green marbles / total number of murbles

so ending green marble = g+2

total number = g +2 +r +14

so probability = (g+2) / (g +r +16)

answer is E
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 17 Feb 2017, 10:18
Answer: [E]

Total choices = g +2 + r + 14

Favourable choices = g+ 2

Probability = (g+2) / (g +r +16)
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 18 Feb 2017, 23:46
Number of possible outcome = g+2
Total number of outcome = g+r+14+2 = g+r+16
So, probability of getting green marble is g+2/g+r+16 ie E
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 21 Feb 2017, 10:28
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Bunuel wrote:
A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)



Since the jar contains g green marbles and r red marbles, it contains a total of g + r marbles. Once 2 green and 14 red marbles are added, the jar then contains a total of g + r + 16 marbles, of which g + 2 are green marbles.

Thus, the probability of selecting a green marble is (g + 2)/(g + r + 16).

Answer: E
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A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 21 Feb 2017, 23:03
Bunuel wrote:
A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)


Probability = Favourable Outcomes / Total Outcomes

Green Marbles = g
Red marbles = r
Total Marbles = g+r

New Number of Green Marbles = g+2
New Number of Red Marbles = r+14
New Number of Total Marbles = (g+2)+(r+14) = g+r+16

Probability of Selecting a Green Marble = Total Green Marble / Total Number of Marbles = (g+2)/(g+r+16)

Answer: option E
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re [#permalink]

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New post 10 Mar 2017, 01:45
the answer should be A
g+2/g+r+16 , probability of selecting green marbles
Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re   [#permalink] 10 Mar 2017, 01:45
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