box contains five sets of balls while there arc 3 balls in each set. Each set of balls has one color which is differen

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Q 2471778626.     box contains five sets of balls while there arc 3 balls
in each set. Each set of balls has one color which is
different from every other set, what is the least
number of balls that must be removed from the box
in order to claim with certainty that a pair of balls of
the same colour has been removed?
IAS 2006 Prelims
A

`6`

B

`7`

C

`8`

D

`9`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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