if someone have 4 red bricks and 8 blue bricks ,he want to arrange them randomly in circular shape,What is the probabilitythat two red bricks are notside by side?

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- August 16th 2012, 09:04 AMMhmh96the probability of bricks arranged randomly.
if someone have 4 red bricks and 8 blue bricks ,he want to arrange them randomly in circular shape,

*What is the probability*that two red bricks are not*side by side*? - August 16th 2012, 11:15 AMSorobanRe: the probability of bricks arranged randomly.
Hello, Mhmh96!

Quote:

If someone have 4 red bricks and 8 blue bricks and arranges them randomly in a circle,

what is the probability that two red bricks areside by side?*not*

There are possible arrangements.

(This includes*duplication from rotations*.)

Place the 8 blue bricks in a circle, leaving a space between them.

. .

Select 4 of the 8 spaces and insert the red bricks.

There are: ways.

Therefore: .