Question

in an ap the sum of first 3 terms is -60 and that of the last 3 are 84 if there tearms what is the sum of the middle 3 terms​

Answer 1

Answer:

the number of terms is odd, the AP can be expressed as (a – 7d), (a – 6d), ---, a, ---, (a + 6d), (a + 7d).

The sum of the first 3 terms is (3a – 18d) = -60 and the sum of the last 3 terms is (3a + 18d) = 84.

Solving these two equations, we get a = 4 and d = 4

the middle term is 4, the sum of the middle 3 term is 12

hope this helps uuuu..