The probability of getting 2 the same colour is 29/72
Probability is the likelihood or chance that an event will occur.
Probability = Expected/Total outcome
Given that the bag is filled with 3 blue, 2 red, and 4 green marble, the total marble is 9
Pr(picking 2 blue and not replaced) = 3/9 * 3/8 = 1/8
Pr(picking 2 red and not replaced) = 2/9 * 2/8 = 1/18
Pr(picking 2 green and not replaced) = 4/9 * 4/8 = 2/9
Taking the sum of the probabilities = 1/8 + 1/18 + 2/9
The probability of getting 2 the same colour = 9+4+16/72 = 29/72
Hence the probability of getting 2 the same colour is 29/72
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