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

O T T F F S S ?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

I know a nine-letter word having only one vowel.
Do you ?

Which five letter word can be added at the end of below word to form a
valid word?

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A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What can you hold in your right hand, but never in your left hand?

I travel all around the world but always stay in the corner. What am I?

Can you count the number of quadrilaterals in the picture below?