It's 1/6 the first time, 1/6 the second time, 1/6 the third time, and 1/6 the fourth time.
The probability of ALL of them happening is
(1/6) to the 4th power = 0.0772 %
(2×10^15)/(4×10^9) = (2/4)×10^(15-9) = 0.5×10^6 = 5×10^5
The first number is 5×10^5 = 500,000 times larger than the second.
One hundred and three million, seven hundred and twenty-seven thousand, four hundred and ninety five.
the answer is 382.41666 hope this helped