13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Find the next number in the series below

21 32 54 87 131 ?

Decode below rebus
D
N
A
T
S , D

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

I am the fastest animal but cannot climb the tree. What am I?

What is both possible and impossible at the same time?

What goes up but never comes down?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Can you find out the remainder when 3^300 is divided by 5?