#### Find the sum of:

(i) 20 terms of the series 2 + 6 + 18 + …

(ii) 10 terms of series 1 + √3 + 3 + …

(iii) 6 terms of the GP. 1, , , …

(iv) 20 terms of the GP. 0.15, 0.015, 0.0015,…

(v) 100 terms of the series 0.7 + 0.07 + 0.007 +…

(vi) 5 terms and n terms of the series

(vii) n terms of the G.P. √7, √21, 3√7, …

(viii)n terms of the G.P. 1, -a, a², -a³, … (a ≠ -1)

(ix) n terms of the G.P. x^{3}, x^{5} , x^{7}, … (x ≠ ±1).

**Solution:**

**More Solutions:**