Why is 6 afraid of 7?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

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

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?