Find P(X = 4) if X has a Poisson distribution such that 3P(X = 1) = P(X

Question:

Find P(X = 4) if X has a Poisson such that 3P(X = 1) = P(X = 2).
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...