What is the next number in this series?

4,12,84,3612....

Count the Triangle in the figure given below:

Next Number in the Series,

5, 16, 49, 104, ?

If an electric train is travelling south, then which way is the smoke going?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I am the fastest animal but cannot climb the tree. What am I?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you find the missing piece of the Porsche?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?