Sets numerical

Posted by urvashi on May 31, 2016; 7:41am
URL: http://discussion-forum.276.s1.nabble.com/Sets-numerical-tp7601141.html

A box contains 100 balls  28red,17blue,21green,10white,12black,12yellow . The smallest no n such that any n balls drawn  from the box will contain atleast 15 balls of the same colour        a.73 b.77 c.81 d.85