Can you identify if it's a murder or a suicide ?

I cannot talk, but I always reply when spoken to. What am I?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What work can one never finish?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Find the missing number in the image below.

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

Our product and our sum always give the same answer. Who are we?