Question

Two boxes contain between them 65 balls of several different sizes. Each ball is white, black,
red or yellow. If you take any 5 balls of the same colour at least two of them will always be
of the same size (radius). Prove that there are at least 3 balls which lie in the same box have
the same colour and have the same size (radius).

Answer 1

@mayankdevnani

Answer 2

@ParthKohli

Answer 3

@hartnn HELP ME DA

Answer 4

@terenzreignz

Answer 5

http://vijay123t.wordpress.com/2010/04/29/solution-rmo-1990-i/
very difficult question...here is your solution!!!! Q-1

ok @goformit100

Answer 6

Thankyou Sir I got the answer

Answer 7

welcome