there are 24 balls of 6 different sizes in a bag there being 4 balls of each size in four different colours in how many ways 4 balls can be selected so that they are of different colours

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- January 20th 2011, 04:42 AMprasumcombination
there are 24 balls of 6 different sizes in a bag there being 4 balls of each size in four different colours in how many ways 4 balls can be selected so that they are of different colours

- January 20th 2011, 06:11 AMSoroban
Hello, prasum!

This one is very easy.

Exactly where is your difficulty?

Quote:

Perhaps the idea of six sizes confused you.

This was only to show that the six red balls are distinguishable.

. . They could have been simply numbered: .

There are 6 choices for a red ball.

There are 6 choices for a yellow ball.

There are 6 choices for a blue ball.

There are 6 choices for a green ball.

Therefore, there are: . ways.