Question

The sum of the first 6 terms of an ap is zero and the Fourth term is 2. Find the sum of its first 30 terms.​

Answer 1

Answer:

Step-by-step explanation:

A4=a+3d

2=a+3d

a=2-3d.......(1)

Sun if first 6 terms is 0

0=n/2(2a+(n-1)d

0=6/2(2(2-3d)d. [using eq.1]

0=3(4-d)

-4=-d

d=4......(2)

Use eq2 in 1 we get a=-10

Now sum of 30 terms

30/2(2*-10+(30-1)4

96*15

1440

Answer 2

Answer:

The sum of the first six terms of an AP is zero and its fourth term is 2.Find the sum of its first 30 terms. Get the answers you need, now!