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The sample space has size 10. 5c2=10. Imagine a slot of 5 . The rightmost 3 are our desired case. Since 2 red balls can go to 5*4/2 places, it has size of 10.Now if we put 1 red ball in 3 places , other goes to other 2 place. so total combination is 3*2 .So, the probability will be 6/10.

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