Question

4. How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is
zero?

Answer 1

Answer:

19 terms should be taken

Step-by-step explanation:

sum of n terms=n/2[2a+(n-1)d]

Here,a=27

d=-3

sum of n terms=0

find n

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

2(27)+(n-1)(-3)=0

54-3(n-1)=0

3(n-1)=54

n-1=54/3

n-1=18

n=19

If you satisfy with the answer then It's my pleasure