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hi,initially I am aware that for continuous distributions, P(X=x) always equals zero, but when I look at some derivations as the attachment I see that for exponential variable they use exponential pdf when they want to find P(X1=x). My question is :if we say that for continuous distributions, P(X=x) always equals zero why P(X1=x) equals exponential pdf here why it is not 0 ?????????

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# I P(X=x) in continuous distributions

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