Question

Let 𝑋 be a random variable having a probability mass function 𝑝(𝑥) which is positive only for non-negative integers. If
𝑝(𝑥+1)=($\frac{ ln\,\, 3}{𝑥+1}$) 𝑝(𝑥), 𝑥=0, 1, 2, … ,
then 𝑉𝑎𝑟(𝑋) equals

• A. ln 3
• B. ln 6
• C. ln 9
• D. ln 18

Answer 1

Answer: (A)

ln 3

Answer 2

The correct option is (A): ln 3