Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Can you solve the maths in the below-given picture equation?

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?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?