Mathematics

Mathematics

Problem

Find a formula for SnS_n , the sum of the first nn terms of the series: a. 3+3+33+9+…\sqrt{3} + 3 + 3\sqrt{3} + 9 + \dots b. 12+6+3+112+…12 + 6 + 3 + 1\frac{1}{2} + \dots c. 0.9+0.09+0.009+0.0009+…0.9 + 0.09 + 0.009 + 0.0009 + \dots d. 20−10+5−212+…20 - 10 + 5 - 2\frac{1}{2} + \dots

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