Can you find the odd number in the following?

2716, 4135, 5321 and 7145

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?