Introduction

A sequence is usually a set or an array of numbers that has a strict way for moving from the nth term to the (n+1)th term.

If f(n) = f(n-1) + c where c is a constant value, then f is an arithmetic sequence.

An example would be (where the first term is 0 and the constant is 1) is [0, 1, 2, 3, 4, 5, ... and so on]

Else if f(n) = f(n-1) * c where c is a constant value, then f is a geometric sequence.

Example where the first term is 2 and the constant is 2 will be [2, 4, 8, 16, 32, 64, ... to infinity ... ]

There are some other sequences that aren't arithmetic nor are they geometric.

Here is a link to feed your brain! : Sequence

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Task

You're going to write a function that's going to return the value in the nth index of an arithmetic sequence. (That is, adding a constant to move to the next element in the "sequence").

The function takes three inputs first,n,c where:

• first is the first value in the index 0.
• n is the index of the value we want.
• c is the constant added between each term.

Remember that first is in the index 0 .. just saying ...