Our product and our sum always give the same answer. Who are we?

What Deficiency does the below rebus represent?

VIT_MIN

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Solve below popular number sequence
314 159 265 358 979 323 846 ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

How many triangles can you find in this given picture?

What has to be broken before you can use it?

The answer I give is yes, but what I mean is no. What was the question?