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B. P. Wadia was born in 1881.
P. B. Sreenivas was born on September 22, 1930.
P=B×RB=P÷RR=P÷B
If A and B are two events then P(A or B) = P(A) + P(B) - P(A and B)
If A and B are mutually exclusive event then Probability of A or B is P(A)+P(B). If they are not mutually exclusive then it is that minus the probability of the P(A)+P(B) That is to say P( A or B)= P(A)+P(B)- P(A and B). Of course it is clear that if they are mutually exclusive, P(A and B)=0 and we have the first formula.