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If a & b are constants, then Var (a + bX) equal to_________________?

/ RANDOM VARIABLE AND PROBABILITY DISTRIBUTIONS, Statistics Mcqs / By
If a & b are constants, then Var (a + bX) equal to_________________?

A. Var(bX) + a
B. b2 Var(X)
C. b Var(x)
D. None of these