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Open Question: Maths Question~Hurry, fast!!!!?

Open Question: Maths Question~Hurry, fast!!!!?

Find the range of values of x for which the following series converge and find the sum to infinity.

Q1) 1+2x+4x^2+8x^3+......
Q2) (a+x)-1+(1/(a+x))-(1/(a+x)^2)+.....

Please show all workings.....


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