Number System
If (47)² is added to the square of a number the answer thus obtained is 2290. What is the number ?

10
8
7
9

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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 ?

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

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