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In how many ways can 4 red, 3 yellow and 2 green discs be arranged in a row if the discs of the same colour are

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In how many ways can 4 red, 3 yellow and 2 green discs be arranged in a row if the discs of the same colour are indistinguishable? 

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Total number of discs = 4 + 3 + 2 = 9 

Out of nine, 4 are of one king, 3 are of second kind and 2 are of third kind 

∴ Required arrangements

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