Question

The 10th term of the G.P. $$1, -a, a^2, -a^3, ..........$$ is ______.

विकल्प

• $$a^9$$

• $$-a^{10}$$

• $$-a^{11}$$

• $$-a^9$$

Answer 1

The 10th term of the G.P. $$1, -a, a^2, -a^3, ..........$$ is –a⁹.

Explanation:

The common ratio is $$-a$$, so $$T_{10}=1\times(-a)^9=-a^9$$.