a box contains 20 electric bulbs , out of which 4 are defective . 2 bulbs are chosen at random from this box . The probability that at least one of these is defective is
A. 7/19
B. 6/19
C. 5/19
D. 3/19
সঠিক উত্তরঃ
C.
5/19
Explanation:
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