IKMC Confusion: Marbles in a Bag question

IKMC Confusion: Marbles in a Bag question

Postby IbrahimAhmad2004 » Fri Feb 08, 2019 1:02 pm


A bag contains only red and green marbles. For any 5 marbles we pick, at least one is red. For any 6 marbles we pick, at least one is green. What is the largest number of marbles the bag can contain?
A 11
B 10
C 9
D 8
E 7
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Re: IKMC Confusion: Marbles in a Bag question

Postby invinciblelokesh » Mon Feb 11, 2019 6:19 am

9 balls , 5 Red + 4 Green balls

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Re: IKMC Confusion: Benjamin Paper 2017 Q29

Postby IbrahimAhmad2004 » Mon Feb 11, 2019 11:57 am

Julia has four different coloured pencils and wants to use some or all of them to paint a map of an island divided into four nations. The map of two nations with a common border cannot have the same colour. In how many ways can she colour the map of the map?

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