TS EAMCET 19-July-2022 Shift 1 Solved Paper

Section: Mathematics

Question : 39 of 160

Marks: +1, -0

A random variable X has the range {0,1,2,...}. If P(X=r)=k(1+r)3−r, for r=0,1,2,... where k>0 is a real number, then P(X=0)+P(X=1)+P(X=2)=

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