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many balls must

by sanju09 » Tue Feb 23, 2010 3:23 am
A box contains 20 balls, of which 4 are white, 7 are black and 9 are red. At least how many balls must one remove in a single pick to get 4 balls of the same color?
(A) 9
(B) 10
(C) 13
(D) 14
(E) 15
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by harsh.champ » Tue Feb 23, 2010 3:25 am
sanju09 wrote:A box contains 20 balls, of which 4 are white, 7 are black and 9 are red. At least how many balls must one remove in a single pick to get 4 balls of the same color?
(A) 9
(B) 10
(C) 13
(D) 14
(E) 15
3,3,3 from each color.
The 10th ball would correspond to any of the 3 colors
Hence,B should be the answer.
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