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if nth term of ap is (2n+1),what is the sum of its three term
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if nth term of ap is (2n+1),what is the sum of its three term Related...
Nth term=(2n+1)
1st term= 2×1+1=3
2nd term= 2×2+1=5
3rd term= 2×3+1=7
AP:- 3,5,7......, (2n+1)
here, a=3, d=7-5=5-3=2, n=3, l=7
Sn=n/2(a+l)
S3=3/2(3+7)
S3=3/2×10
S3=30/2
S3=15.
So, the sum of its first 3 terms is 15.
1st term= 2×1+1=3
2nd term= 2×2+1=5
3rd term= 2×3+1=7
AP:- 3,5,7......, (2n+1)
here, a=3, d=7-5=5-3=2, n=3, l=7
Sn=n/2(a+l)
S3=3/2(3+7)
S3=3/2×10
S3=30/2
S3=15.
So, the sum of its first 3 terms is 15.
Community Answer
if nth term of ap is (2n+1),what is the sum of its three term Related...
Nth term is (2n+1)
put n=1
(2(1)+1)= 2+1 = 3
put n=2
(2(2)+1)= 4+1 = 5
put n = 3
(2(3)+1)= 6+1= 7
sum of three term= a1+a2 +a3=3+5+7=15
put n=1
(2(1)+1)= 2+1 = 3
put n=2
(2(2)+1)= 4+1 = 5
put n = 3
(2(3)+1)= 6+1= 7
sum of three term= a1+a2 +a3=3+5+7=15
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