The bigger part could be any number from 10000 to 20000. Now, if the bigger part is to be at least twice as much as the smaller part, we have X≥2y‌ or ‌X≥2(20000−X)or X≥‌
40000
3
We know that ˙X lies between 10000 and 20000 , the probability that X lies between ‌