Question
There are 5 boxes, each containing 5 cubes of different colours-red, yellow, green, blue and black. I want to draw a different coloured cube from each box. If from the first and the second box, I drew red and green cubes respectively, then what is the maximum number of trials required at the remaining boxes so as to draw different coloured cubes?
Answer: Option B
:
B
Number of trials needed at the 3rd box to ensure a colour other than green and red is picked is 3
Similarly, number of trials needed at the 4th box to ensure a new colour is
picked at the maximum=4
And number of trials in the last box to pick a different colour other than
that in the other 4 at a maximum=5.
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:
B
Number of trials needed at the 3rd box to ensure a colour other than green and red is picked is 3
Similarly, number of trials needed at the 4th box to ensure a new colour is
picked at the maximum=4
And number of trials in the last box to pick a different colour other than
that in the other 4 at a maximum=5.
Total = 3+4+5=12
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