Number System
The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ?

21.84
24.84
25.84
27.84

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Number System
A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ?

29/145
30/146
28/144
27/143

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