If X∼Binomial(n,p)X \sim Binomial(n, p)X∼Binomial(n,p), what is the formula for the variance?
npnpnp
np(1−p)np(1-p)np(1−p)
n(1−p)n(1-p)n(1−p)
p(1−p)p(1-p)p(1−p)