1 + 3 + 7 + 15 + 31 + ...... + to n terms

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

Sum of the series 1+3+7+15+....... upto n terms.

1+ 3+ 7 + 15… n terms =

1/2+3/4+7/8+15/16+..... t o n terms =

Find the sum of the following series : 3.1^2+5.2^2+7.3^2 + .... to n terms .

Check whether a] -1 is a term of 33, 31, 29, …..... b] 54 is a term of 3, 9, 15, ........... c] -10 is a term of -3, -5, -7, ......

Find the sums of the indicated number of terms of the following geometric progressions : 1,1/3,1/9 .........., n terms, 5 terms.

The sum to n terms of the series 1/2 + 3/4 + 7/8 + 15/16 + ....... is

Find the sum of the first n terms of the series : 3 + 7 + 13 +21 + 31 +.....