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?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

what one word does the below rebus identifies?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Which point will the car reach to go out?

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?