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This is a homework problem that I'm having a very hard time with. We are given that f(x)=e^(-x) for X greater/equal to zero. The question is to find f(x|A) where A is the union of the events (1 less/equal x, and x greater than 10). I can't figure out how to go about doing this....I thought of taking the complement of A and solving the conditional probability for x between 1 and 10, but then if I take 1 minus that, I don't think that f(x|A) will have an area less than 1, and it will also be negative at points. Any help is greatly appreciated.

Thank you.

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# Finding the conditional pdf

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