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If the common ratio of a G.P. is 2/3 and the sum to infinity is 12, find the first term. |
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Answer» r = \(\frac23,\) sum to infinity = 12....[Given] Sum to infinity = \(\frac{a}{1-r}\) 12 = \(\cfrac{a}{1-\frac23}\) a = 12 x \(\frac13\) \(\therefore\) a = 4 |
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