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cookiesyum

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## Homework Statement

Let X1 X2 X3 be independent and identically distributed random variables with common pdf f(x) = e^-x 0<x<infinity, zero elsewhere.

Evaluate P(X1 < X2|X1 < 2X2) and P(X1 < X2 < X3|X3 < 1).

## The Attempt at a Solution

Would appreciate any hints as to where to start...