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A bag contains 20 balls. 8 balls are green, 7 are white and 5 are red. What is Hie minimum number of balls that must be picked up from the bag blindfolded (without replacing any of it) to be assured of picking at least one ball of each colour?

[Paper II (CSAT) Analysis 2017]
A
B
C
D

EXPLANATION

Ans (b) A question from basic logic and arrangements. There are 8 balls tha...
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