Sum of the series by the method of difference.

The sum of the series: is:

Two PN -junction can be connected in series by three different methods as shown in the figure. If the potential difference in the junction is the same, then the correct connection will be

An arithmetic series consists of 2n terms, and the first term equals the value of the common difference. If a new series is formed taking the 1st, 3rd, 5th,... (2n – 1) th term of the old series, find the ratio of the sum of the new series to that of the sum of the terms of the old series.

The sum of 30 terms of a series in A.P., whose last term is 98, is 1635. Find the first term and the common difference.

The sum of a series of terms in A.P. is 128. If the first term is 2 and the last term is 14, find the common difference.

Sum Of Series By Cancellation Method

The sum to infinity of a geometric series is 32. The sum of the first four terms is 30 and all the terms are positive.Find the difference between the sum to infinity and the sum of the first eight terms

If the ratio of the sum of first three terms to the sum of next three terms of a geometric series be 125:27 ,then the common ratio of the series be