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The formula for infinite geometric series is s=a1/1-r. If you would need to find your r, the ratio. The ration in this problem is -1/5. We already know your a1, your first number. Plug everything in. s= 4/1-(-1/5) s=4/1+1/5 s=4/(6/5) s=4*5/6 (multiplying the reciprocal is the same as dividing) s=20/6 s= 3 1/3
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