Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Can you name some countries which do not have the alphabet 'A' in them?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

What always comes into a house through the keyhole?

Find the hidden tiger in the given optical illusion ?

By what process could you make a 'Tea-Table' into food?

When it is alive we sing, when it is dead we clap our hands. What is it?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

what's the probability of getting a king or a queen from a pack of 52 cards?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.