What Deficiency does the below rebus represent?

VIT_MIN

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

I have an eye but still cannot see.

Who am I?

why number 8549176320 is one of a kind?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Why is it very easy to weigh a fish?

Why 1729 is a magic number? Answer Logically.