4. How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is
zero?
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2
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
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