In how many ways can you deal four cards to four people from a deck of 16?
In how many ways can you deal four cards to four people from a deck of 16 such that each receives exactly one black card?
It depends on what you mean by "solve." The OP might be looking for a curve in space or a surface or some such. However, the "natural numbers" part confuses the issue.
Saying that nothing can travel faster than light means that matter, energy or information cannot travel faster than light. However, some "things" can and do move faster than light. Imagine standing at the center of a circle whose radius is 186,000 miles. There is a reflecting wall on the...
That would be a fundamental identity for logarithms and should have been the first thing you learned about them. Basically, exponentials and logarithms are inverse functions of each other. Check with your textbook. :)