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A = 20 - x
B = 22 - x
A + x + B = 34
20 - x + x + 22 - x = 34
42 - x = 34
- x = 34 - 42
- x = - 8
x = 8
Peluang
8 / 40 = 1 / 5 = 0,20 (c)