CUET Preparation Today
CUET
-- Mathematics - Section B2
Index Numbers and Time Based Data
If X is a Poisson variable such that $P(X=1)=2P(X=2),$ then $P(X=3)$ is :
$\frac{1}{e}$
$e$
$\frac{6}{e}$
$\frac{1}{6e}$
