marissa946 marissa946

04-05-2020
Mathematics

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the first term in a geometric series is 64 and the common ratio is 0.75. Find the sum of the first 4 terms in a series.

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redbudtree84 redbudtree84

04-05-2020

hi

u0 = 64 with u(n+1) = un *0.75

u3 = 64 *0.75^3 = 27

sum is : 64 * ( 0.75^4 -1) / 0.75-1 = 175

manual proof : 64 + 48+36+27 = 175

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