# GEOMETRY

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The squares of a 3×3 grid of unit squares are coloured randomly and independently so that each square gets one of 5 colours. Three points are then chosen uniformly at random from inside the grid. The probability that these points all have the same colours can be expressed as a/b, where a and b are coprime positive integers. What is the value of a+b?

• GEOMETRY -

I'm so confused..
I don't know how to solve

• GEOMETRY -

is it 458?

• GEOMETRY -

no not 458

• GEOMETRY -

give me the solution..

• GEOMETRY -

1528

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