Number System
The sum of three consecutive multiples of 3 is 72. What is the largest number?

24
36
21
27

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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 ?

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

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