Task: Question Answering
Input (English): Problem: a box contains 21 electric bulbs, out of which 4 are defective. two bulbs are chosen at random from this box. the probability that at least one of these is defective is
Options: a. 4 / 19, b. 7 / 19, c. 12 / 19, d. 21 / 95, e. 31 / 88
Output (English): e