Q36
A box contains 20 electric bulbs, out of which 4 are defective. Two balls are chosen at random from this box. The probability that at least one of them is defective, is -
A.
B.
Answer
C.
D.
E.
None of these
Answer: Option B
Solution
Answer: Option B
Solution:
P (none is defective)= n (E) =
P (at least 1 is defective)
=