if nth term of ap is (2n+1), what is the sum of its three terms?
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Answered by
65
nth term = 2n+1
a1 = 2×1+1 = 3...
a2=2×2+1=5....
d=a2-a1 = 5-3= 2....
S3 = 3/2[ 2×3 + (3-1) 2 ]
= 3×10/2 = 15....
so , the sum of first three terms is 15.....
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a1 = 2×1+1 = 3...
a2=2×2+1=5....
d=a2-a1 = 5-3= 2....
S3 = 3/2[ 2×3 + (3-1) 2 ]
= 3×10/2 = 15....
so , the sum of first three terms is 15.....
please mark it as brainliest ☺️☺️
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Answered by
2
Answer:
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Step-by-step explanation:
a = (2×1+1)
=(2+1)
=3
a2= (2×2+1)
=(4+1)
=5
d = a2-a1
=5-3
= 2
Therefore, sum of first three terms
=3/2(2×3+2(2))
=3/2(6+4)
=3/2×10
=15
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