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Bunuel
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An urn contains 5 boxes. Each box contains 5 balls of different colour 22 Jan 2021, 05:15
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C
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75% (hard)

Question Stats:

56% (02:05) correct 44% (02:32) wrong based on 198 sessions

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An urn contains 5 boxes. Each box contains 5 balls of different colours red, yellow, white, blue and black. Rangeela wants to pick up 5 balls of different colours, a different coloured ball from each box. If from the first box in the first draw, he has drawn a red ball and from the second box he has drawn a black ball, find the maximum number of trials that needed to be made by Rangeela to accomplish his task if a ball picked is not replaced.

A. 7
B. 11
C. 12
D. 20
E. 60
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C
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An urn contains 5 boxes. Each box contains 5 balls of different colour 22 Jan 2021, 06:31
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Red & Black already chosen.

Hence he would to have to pick at-least 3 balls from 3rd Urn for a different collar other than red & black
4 balls from 4th Urn
All balls from 5th Urn.

Hence answer should be 3+4+5 = 12

Option C
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An urn contains 5 boxes. Each box contains 5 balls of different colour 12 Mar 2021, 11:08
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Bunuel
An urn contains 5 boxes. Each box contains 5 balls of different colours red, yellow, white, blue and black. Rangeela wants to pick up 5 balls of different colours, a different coloured ball from each box. If from the first box in the first draw, he has drawn a red ball and from the second box he has drawn a black ball, find the maximum number of trials that needed to be made by Rangeela to accomplish his task if a ball picked is not replaced.

A. 7
B. 11
C. 12
D. 20
E. 60
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In order to get a different colored ball from the 3rd box, Rangeela must try 3 times to know that there is a different color balls - any of the yellow, white and blue. It is because at least twice we have two unfavourable picks i.e. red and black.
Similarly, for the 4th box it has to be at least 4 trials(with 3 unfavourable) to pick a different colored ball and 5th box, 5 trials.

Answer = 3+4+5 = 12.

Answer C.
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An urn contains 5 boxes. Each box contains 5 balls of different colour 12 Nov 2021, 22:32
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Bunuel
An urn contains 5 boxes. Each box contains 5 balls of different colours red, yellow, white, blue and black. Rangeela wants to pick up 5 balls of different colours, a different coloured ball from each box. If from the first box in the first draw, he has drawn a red ball and from the second box he has drawn a black ball, find the maximum number of trials that needed to be made by Rangeela to accomplish his task if a ball picked is not replaced.

A. 7
B. 11
C. 12
D. 20
E. 60
Show more

5 boxes, each containing 5 different color balls. ONE color to be picked up from each box.

Now, we have already picked two colors from two boxes.

1) THIRD box: Any of the three remaining colors, Y, W or B, is to be chosen.
Worst scenario - the first two picks are R and black. So, the third has to be any of the Y, W and B.
3 picks.

2) FOURTH box: Any of the two remaining colors is to be chosen.
Worst scenario - the first three picks are color picked from first three boxes. So, the fourth has to be any of the two we are looking for.
4 picks.

3) FIFTH box: The only remaining color is to be chosen.
Worst scenario - the first four picks are color picked from first four boxes. So, the fifth has to be the color we are looking for.
5 picks.

Total ways: 3+4+5 = 12
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An urn contains 5 boxes. Each box contains 5 balls of different colour 09 Mar 2025, 07:43
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