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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 -

    Have you got the answer??
    I'm so confused..
    I don't know how to solve

  • GEOMETRY -

    is it 458?

  • GEOMETRY -

    no not 458

  • GEOMETRY -

    so what's the answer?
    give me the solution..

  • GEOMETRY -

    1528

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