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A box contains 20 electric bulbs, out of which 4 are defective. Two balls are chosen at random from this box. The probability that at least one of them is defective, is -
Options:
A .  $$\frac{4}{19}$$
B .  $$\frac{7}{19}$$
C .  $$\frac{12}{19}$$
D .  $$\frac{21}{95}$$
E .  None of these
Answer: Option B
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