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A dictionary will give hundreds of words starting with b or p. I do not have time to list them.
False. In order for the line PQ to lie in plane B, then both P and Q must lie in plane B.
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.
Consider events A and B. P(A or B)= P(A) + P(B) - P(A and B) The rule refers to the probability that A can happen, or B can happen, or both can happen together. That is what is stated in the addition rule. Often P(A and B ) is zero, if they are mutually exclusive. In this case the rule just becomes P(A or B)= P(A) + P(B).