Question

The sum of n terms of a G.P. with first term a and common ratio r, when r = 1, is given by:

Options

• $$S_n = \frac{a(1 - r^n)}{1 - r}$$

• $$S_n = \frac{a(r^n - 1)}{r - 1}$$

• $$n^2a$$

• $$na$$

Answer 1

`bb(na)`

Explanation: 

When $$r = 1$$, every term equals $$a$$. Therefore, the sum of $$n$$ terms is $$a + a + \cdots + a = na$$.