Find the sum of the following series: `1+5+3+9+5+13+7+… ` 20 terms

Find the sum of the following series : (i) 1,3,5,7... upto 12 terms.

Find the sum of the following series: 1+4+7+10+… to 40 terms

Find the sum of the following A.P.'s : (i) 3,8,13, .... to 20 terms. (ii) 1,4,7,......... to 50 terms. (iii) 8,5,2, .... to 25 terms. (iv) (a+b), (2a+3b), (3b+5b), ........ to n terms.

Find the sum of the following series: 3/(sqrt5)+4/sqrt(5)+… 25 terms

Find the sum of the following series to n terms 5+7+13+31+85+

Find the sum of the series : 5+13+21++181.

Find the sum of the given series 3+5+9+17+33 + ..

Find the sum of the series 3 + 7 + 13 + 21 + 31 + … to n terms . Find the sun when n=20

Find the sum of the following series to n term: 1. 2. 5+2. 3. 6+3. 4. 7+..........

Find the sum of the following geometric series: x^3, x^5, x^7, to\ n terms