Which of the following series is convergent?

MATHEMATICS · Single correct · CBSE · Mathematics · Sequences and Series · Sequences and Series

Problem

Which of the following series is convergent? (a)

\displaystyle \sum_{n=0}^{\infty} \dfrac{(-3)^{n}}{2^{n}}

(b)

\displaystyle \sum_{n=0}^{\infty} 5(-1)^{n}

(c)

\displaystyle \sum_{n=0}^{\infty} 5(-0.9)^{n}

(d)

\displaystyle \sum_{n=0}^{\infty} 4(1.2)^{n}