Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Which letter of the alphabet has the most water?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

What number when divided in half becomes zero?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What does a man do only once in his lifetime, but women do once a year after they are 29?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?