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CBSE Class 10 Answered

If nth term of an AP is (2n+1), what is the sum of its first three terms?
Asked by agraharianiruddha | 26 Dec, 2018, 18:40: PM
answered-by-expert Expert Answer
tn = 2n +1 
t1 = 2+1 =3
t2 = 4+1 = 5
t3 = 6 +1 = 7
S3 = 3 + 5 +7 = 15
Answered by Arun | 27 Dec, 2018, 09:03: AM

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