today my friend shot me with a question but sadly i couldn't solve it. Here is the question:

let $\displaystyle X_1$ and $\displaystyle X_2$ be two iid random variables which follow Bernoulli distribution with $\displaystyle p$. But $\displaystyle p$ is such that it lies between $\displaystyle 1/3$ and $\displaystyle 2/3$. What will be an unbiased estimator for $\displaystyle p$ now.