Probability Mcqs

Q.  A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective.

a. 62/63
b. 125/126
c. 1/63
d. 1/126

ANSWER: See Answer

Out of nine, five are good and four are defective. Required probability = ⁴C₄/⁹C₄ = 1/126
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