Samuel Pepys wrote Isaac Newton to ask which of three events is more likely: that a person get...

Samuel Pepys wrote Isaac Newton to ask which of three events is more likely: that a person get

1. at least 1 six when 6 dice are rolled
2. at least two sixes when 12 dice are rolled, or
3. at least 3 sixes when 18 dice are rolled.

What is the answer?