Find the last number in the series below:

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You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

How can you tell a raw egg from a hard-boiled egg?

If an electric train is travelling south, then which way is the smoke going?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

What's the only room from which no one can enter or leave

What came first, the chicken or the egg?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.