if A,B,C are events associated with a random experiment such that P(exactly one of events A or B)=P(exactly one of B OR C)=P(exactly one of A OR C)=p and P(all three events occuring simul†an eously )=p^2 ,then find probability of occurrence of at least one of A ,B, and C

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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)= $p^{2}$ , where 0<p<1/2. Then the probability of at least one of the three events A, B and C occuring is

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