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 ofthem is defective, is -

A box contains 20 electric bulbs, out of which 4 are defective. Two ba

1.	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 ofthem is defective, is -
A.	$\frac{4}{19}$$
B.	$\frac{7}{19}$$
C.	$\frac{12}{19}$$
D.	$\frac{21}{95}$$
E.	one of these
Answer» C. $\frac{12}{19}$$

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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 ofthem is defective, is -

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