Max Logix

If you had an infinite supply of water and a 5 quart and 3 quart pail, how would you measure exactly 4 quarts?

You have 8 balls. One of them is defective and weighs less than others. You have a balance to measure balls against each other. In 2 weighings how do you find the defective one?

Get yourself listed in the hall of fame. I did it less than 30 Seconds
This is a mathematical challenge, and it's been said that:
  If you're

•  An engineer, you should be able to solve it in (under) three minutes,
•  An architect, in three hours;
• A doctor, in six hours;
• An accountant, in three months and
• A lawyer, probably never.

 What is the missing number in this logical series?

 1, 2, 6, 42, 1806, ____???

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