A box contains ELEVEN bulbs out of which 5 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good
Choose one:  A) 65/66  B) 67/66  C) 69/66  D) 64/66  E) 61/66
Required probability = 1-5C4/11C4 = 1 - 1/66 = 65/166.
65/66nswer:65/66
<result>A</result>
A box contains ELEVEN bulbs out of which 5 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good