Number System
The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ?

84.5
85.5
83.5
82.5

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Number System
A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

39/340
51/340
45/340
58/340

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