Question
A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that at least one bulb is good.
Answer: Option C
Required probability
$$\eqalign{
& = 1 - \frac{1}{{126}} \cr
& = \frac{{125}}{{126}} \cr} $$
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Required probability
$$\eqalign{
& = 1 - \frac{1}{{126}} \cr
& = \frac{{125}}{{126}} \cr} $$
Was this answer helpful ?
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