Question

Here are the first five terms of a number sequence. 3 7 11 15 19 Write down an expression, in terms of n, for the nth term of the number sequence.

Answer 1

4n - 1

Explanation:

The expression is

As we know that

a + (n - 1)d

where

a denotes the first term

n denotes the nth term

And, d denotes the difference

Now

3 + (n - 1) 4

3 + 4n - 4

4n - 1