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

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Find the missing number in the sequence below:

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

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?