You randomly select an integer from 0 to 4 ​(inclusively) and then randomly select an integer from 0 to 49 ​(inclusively). What is the probability of selecting a 2 both​ times?   The probability is______ ​(Type an integer or a decimal. Do not​ round.)

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Q: 1. Show that the scaled symmetric random walk (W) (t): 0≤t≤T} is a martingale.

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