IF and event cannot occur then its probability is (a) 1 (b) 12 (c) 34 (d) 0
For the three events A, B and C, P (exactly one of the events A or B occurs) = P(exactly one of the events B or C occurs) = P(exactly one of the events C or A occurs)=p and P(all the three events occur simultaneously)=p2, where 0<p<1/2. Then the probability of at least one of the three events A, B and C occuring is