A box contains 20 electric bulbs, out...

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 `4/(19)` (b) `7/(19)` (c) `(12)/(19)` (d) `(21)/(95)` (e) None of these

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