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.

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

What do you answer even though it never asks you questions?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

Through your logical capabilities, can you make 7 an even?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you Find and name the hidden bird in the picture below ?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

Solve the following series:
AZ, GT, MN, __, YB