4. Which ones of the following functions are valid CDFs (all have x ≥ 0): (b) 1-exp(-) (0)1-exp(-) expx) 1. 2 2 X (g) 1-exp| Х (а) 1-, ехр (e) 1--*exp(-) (f) 1 exp 2 X xP(-x) 2 (d) 1-exp|

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