Evaluate the series 1 + 4 + 16 + 64 + 256 + 1024 ...

The answer the question above, we may directly add them using our calculator since there are only 6 terms in the series. The addition will give us an answer of 1365. The sequence is also geometric with first term equal to 1 and the common ratio equal to 4. We may use the formula,

S = (a1) x (r^n - 1) / (r - 1)

Using the equation, we may still arrive at the same answer.