Verify that the following function is a probability mass function, and determine the requested probabilities. sC) = (343/57)(1/7).x {1,2,3) Round your answers to four decimal places (e.g. 98.7654), Is the function a probability mass function? (a) P(X S 1) = (b) P(X > 1) = (c) P(2 < X < 8) =

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