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Normalize an infinite geometric probability law

XX has probability mass function P(X=x)=c(4/5)xP(X=x)=c(4/5)^x for integers x≥0x\ge0. Find (i) cc and (ii) P(X≥3)P(X\ge3).

CJC · Lecture · Example 3

Name the events, identify the sample space, and state which outcomes or conditions are being counted.

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