Find the missing letter in the last circle logically in the given below picture.

What happened when the wheel was invented?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Why is a river so rich ?

What kind of tree can you carry in your hand?

Find out the number of circles in the given picture having Illusion

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

You can hear me, but you can't touch or see me.

What am I?