Which fur should we be getting from the Lion?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

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?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

When can we add 2 to 11 and get 1 as the correct answer?