The first term of an ap is - 504 while
the sum of its 9 terms is-126 find
sum of its 30 terms

The sum of its 30 terms is 38167.5

Step-by-step explanation:

Given:

The First term in the AP is -504

The Sum of its 9 terms is -126

To Find:

The sum of its 30 terms = ?

Solution:

The sum of n terms of an AP:

The sum of 9 terms of an AP:

(-4536) +36d = -126

36 d = -126+4536

36 d=  4410

d = 122.5

The sum of its 30 terms is

44

step-by-step explanation:

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