What Deficiency does the below rebus represent?

VIT_MIN

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Which is the smallest number that you can write using all the vowels exactly once?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

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

Can you write down eight eights so that they add up to one thousand?

Find the number of squares in the below-given picture.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches