Jerry is painting a fence made of 4 wooden planks. He has 4 different colours to choose from. He randomly chooses a colour for each plank. What is the probability that all 4 planks are not the same colour?

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Jerry is painting a fence made of 4 wooden planks. He has 4 different colours to choose from. He randomly chooses a colour for each plank. What is the probability that all 4 pla…

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