Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

what's the probability of getting a king or a queen from a pack of 52 cards?

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?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?