Question

If the nth term of an ap is 2n+1 then the sum of its first three term is

Answer 1

Answer:

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Answer 2

Answer:

nth term = 2n+1

a1= 2+1=3

a2= 4+1=5

d = a2-a1

=5-3

=2

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

S3 = 3/2 (6+2×2)

S3 =3/2(10)

S3 =3×5

S3 =15

so, the sum of the first three term is 15

Step-by-step explanation:

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