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A certain box has only a total of 7 red balls and green balls. If two

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A certain box has only a total of 7 red balls and green balls. If two  [#permalink]

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New post 06 Mar 2019, 11:19
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A certain box has only a total of 7 red balls and green balls. If two balls are selected randomly from the box and one ball at a time with replacement, what is the number of red balls?

1) The probability that two balls selected are green balls is (4/7)(4/7)
2) The probability that two balls selected are not green balls is (3/7)(3/7)
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Re: A certain box has only a total of 7 red balls and green balls. If two  [#permalink]

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New post 19 Mar 2019, 12:13
indu1954 wrote:
A certain box has only a total of 7 red balls and green balls. If two balls are selected randomly from the box and one ball at a time with replacement, what is the number of red balls?

1) The probability that two balls selected are green balls is (4/7)(4/7)
2) The probability that two balls selected are not green balls is (3/7)(3/7)


total balls = R+G= 7
#1
The probability that two balls selected are green balls is (4/7)(4/7)
so red = 3
#2The probability that two balls selected are not green balls is (3/7)(3/7)
so red= 3
IMO D
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Re: A certain box has only a total of 7 red balls and green balls. If two   [#permalink] 19 Mar 2019, 12:13
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A certain box has only a total of 7 red balls and green balls. If two

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