Does simple math prove the existence of aliens?

P1: If exactly 1 planet in the universe (Earth) has intelligent life, then the number of planets in the universe (P), and the chances for intelligent life to evolve on the average planet (L) would have to line up such that P * L ~= 1.
P2: There are significantly more possible values for PL than those that ~= 1
P3: It is significantly more likely that PL is a number that is not ~= 1.
P4: Since intelligent life exists on at least 1 planet (Earth), PL has a lower bound that excludes a significant amount of low PL values.

Conclusion: It is significantly more likely that the universe has more than 1 planet with intelligent life.