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12 balls, 3 each of the colours red, green, blue and yellow are put in a box and mixed. If 3 balls are picked at random, without replacement, the probability that all 3 balls are of the same colour
The probability that 1st ball is of 1 colour = 3/12
2nd ball also of same colour without replacement = 2/11
3rd ball of same colour without replacement = 1/1...