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Answer:
Explanation:
There are 5C2 = 10 ways of getting 2 reds
There are 7C2 = 21 ways of getting 2 greens
There are 6C2 = 15 ways of getting 2 yellows
Hence, there are 10 * 21*15 = 3150 ways of picking 6 balls under this restriction
If there were no restrictions then there would be 18C6 = 18564 ways of picking 6 Ball's