How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What is the longest word in the dictionary?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Identify The phrase in the picture.

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?