How to find the sum of a geometric sequence

in 2 dimensions a square has an area of r2 in 3 dimensions a cube has volume r3 etc (yes we can have 4 and more dimensions in mathematics). Geometric Sequences are sometimes called Geometric Progressions (G.P.’s) Summing a

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Find the sum of the following finite series 1 + 0.1 + 0.01 + 0.001 + . + (0.1)⁹ Solution : First term (a) = 1 r = 0.1/1 ==> 0.1 geometric series is having 10 terms. So, the value n