79. Sum of first 10 terms of series `12 +16+ 24 +40+... will be

The sum of first 16 terms of the AP 10, 6, 2 … is

The sum of first 16 terms of the AP 10, 6, 2, … is

The sum of first 16 terms of the AP 10, 6, 2, … is

If the sum of the first n terms of the series

The sum of first 16 terms of the A.P.: 10,6,2,... Is

The sum of first r terms of a series is ar^(2) + br , find the first and 12th terms of the series.

The sum of the first 10 terms common to the series 17, 21, 25, ... and 16, 21, 26,31 , cdots is

The sum of the first n terms of a series is 31, and the sum of the first n - 1 terms of the series is 20. What is the value of nth terms in the series?

The sum of first 16 terms of the A.P.: 10,6,2,… is :