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22 Jan 2021, 05:15
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
55% (02:10) correct
45%
(02:30)
wrong
based on 168
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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
A. 7
B. 11
C. 12
D. 20
E. 60
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
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
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
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.A. 7
B. 11
C. 12
D. 20
E. 60
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.
