Question : The probability that a bulb produced by a factory will fuse after 150 days if used is 0.50. What is the probability that out of 5 such bulbs none will fuse after 150 days of use
(A) 1-\left( \dfrac{19}{20}\right) ^{5}
(B) \left( \dfrac{19}{20}\right) ^{2}
(C) \left( \dfrac{3}{4}\right) ^{5}
(D) 90\left( \dfrac{1}{4}\right) ^{5}
Answer : option (B)
Solution :
