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

O T T F F S S ?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you count the number of squares in the figure below?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?