Practice session

A team of students are preparing to participate in the interschool sports meet. During a practice session, you find some vials with labels of certain cannabinoids. (a) Will you report to the authorities? Why? (b) Name a plant from which such chemicals are obtained. (c) Write the effect of these chemicals on humans body.

The probability of scoring a century in a cricket match by a player is 3/4 if he practices before the match and it is 1/3 if he doesn't practice before the match. The probability that a player attends practice session before the match is 1/3. If it is known that a player scored century in a particular match, the probability that he didn't go for match practice before the match, is. (A) 3/17 (B) 4/17 (C) 6/17 (D) 8/17