Why is a river so rich ?

What Deficiency does the below rebus represent?

VIT_MIN

What does a man do only once in his lifetime, but women do once a year after they are 29?

Next Number in the Series,

5, 16, 49, 104, ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Find the missing number in the image below.

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What's a single-digit number with no value?