Question

tn=2n+1 .find the sum of first three term

Answer 1

Thank your for asking this question. here is your answer:

Tn = 2n + 1

=> First term (n = 1)

First term,T = 2(1) + 1

= 2 + 1

= 3

=> Nth term = n/2(T+Tn)

. =n/2(3+2n+1)

. =n/2(2n+4)  

. =n²+2n

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