# Find the first four terms of the sequence. a1 = 1, a_{n} = 4 • a_{n -1}

We will use the concept of sequence and series in order to find the first 4 terms.

## Answer: The first four terms of the sequence a1 = 1, a_{n} = 4 • a_{n -1} are 1, 4, 16, 64...

Let us see how we will use the concept of sequence and series in order to find the first 4 terms.

**Explanation:**

We have been given the first term that is a_{1} = 1

The formula for the n^{th }term is given by a_{n} = 4 • a_{n - 1}

Second term a_{2} = 4 • a_{1 }= 4(1) = 4

Third term a_{3} = 4 • a_{2} = 4(4) = 16

Fourth term a_{4} = 4 • a_{3} = 64 = 4(16)