1-((2^40)!)/((2^40)^1000000 ((2^40)-1000000)!)

Input

1 - (2^40 !)/((2^40)^1000000 (2^40 - 1000000)!)

Result

0.362196

Decimal approximation

0.365391517987193120131686364873047815927833593198922241581200182932