In an AP the sum of the first 3 terms is 36 and that of the last 3 is 27 If there are 10 terms what ...........

Quantitative Aptitude ( CCS) Arithmetic progression

In an AP, the sum of the first 3 terms is -36 and that of the last 3 is 27. If there are 10 terms, what are the 1 st term and the common difference respectively?

15, 3

-15, 3

15, -3

-15, -3

छोटे Courses बड़े Results

Master Arithmetic progression

Prepare through Micro-courses

Try Now

Explanation:

The AP can be expressed as a, (a + d), ---, (a + 9d).
The sum of the first 3 terms is (3a + 3d) = -36
and the sum of the last 3 terms is (3a + 24d) = 27.
Solving these two equations, we get a = -15 and d = 3.