sum (1+2^j)3^j, j=1..infinity determine whether the series convergent or divergent, and find its sum how do you find the limit of this?
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Originally Posted by justin016 sum (1+2^j)3^j, j=1..infinity determine whether the series convergent or divergent, and find its sum how do you find the limit of this? Note that $\displaystyle \sum_{j = 1}^\infty (1 + 2^j)3^j = \sum_{j = 1}^\infty 3^j + \sum_{j = 1}^\infty 6^j$ Now what kind of series are those? And what can you say about them?
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