Which is Odd One Out and why?

4377

3954

9862

8454

9831

What is black when you buy it, red when you use it, and gray when you throw it away?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What does it mean?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

How many triangles can you find in this given picture?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?