A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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

I have branches, but no fruit, trunk or leaves. What am I?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

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?

Can you place six X (crosses) in below board without making three in a row in any way ?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

The centre of the third figure is empty. What digit should fit inside?