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A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb

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A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb  [#permalink]

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New post 22 May 2018, 09:50
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A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random. What is the probability that Alpha and Navarro both select white marbles.

1. 4/25

2. 9/25

3. 2/5

4. 3/5

5. 4/5

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Re: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb  [#permalink]

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New post 22 May 2018, 10:01
Top Contributor
QZ wrote:
A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random. What is the probability that Alpha and Navarro both select white marbles.

1. 4/25

2. 9/25

3. 2/5

4. 3/5

5. 4/5



P(both are white) = P(1st marble is white AND 2nd marble is white
= P(1st marble is white) x P(2nd marble is white)
= 4/10 x 4/10
= 16/100
= 4/25


Answer: A

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Re: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb  [#permalink]

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New post 01 Jun 2018, 22:46
QZ wrote:
A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random. What is the probability that Alpha and Navarro both select white marbles.

1. 4/25

2. 9/25

3. 2/5

4. 3/5

5. 4/5


Total marbles = 10

White marbles = 4

Required outcome = 4/10 * 4/10

4/25

(A)

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Re: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb  [#permalink]

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New post 11 Aug 2019, 19:05
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AkshdeepS wrote:
A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random. What is the probability that Alpha and Navarro both select white marbles.

1. 4/25

2. 9/25

3. 2/5

4. 3/5

5. 4/5


The probability that both select white marbles is 4/10 x 4/10 = 2/5 x 2/5 = 4/25.

Answer: A
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Re: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb  [#permalink]

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New post 11 Aug 2019, 20:54
AkshdeepS wrote:
A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random. What is the probability that Alpha and Navarro both select white marbles.

1. 4/25

2. 9/25

3. 2/5

4. 3/5

5. 4/5


Given: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marble from the bag at random, records its color and places it back in the bag. Then, Navarro selects a marble from the bag at random.

Asked: What is the probability that Alpha and Navarro both select white marbles.

Probability that Alpha selects white marbles = \(\frac{4}{10}\)
Probability that Navarro selects white marbles = \(\frac{4}{10}\)

Probability that both select white marbles \(= \frac{4}{10} * \frac{4}{10} = \frac{2}{5} * \frac{2}{5} = \frac{4}{25}\)

IMO A
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Re: A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb   [#permalink] 11 Aug 2019, 20:54

A bag contains 6 red marbles and 4 white marbles. Alpha selects a marb

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