Question

Tn=2n+1 find the sun of first three terms

Answer 1

hope it will be help you

Answer 2

t(n) = 2n + 1 ;

now, n = 1 , 2 , 3 ;

then, t(1) = [ 2*(1) + 1 ] = 3 ;

t(2)= [ 2*(2) + 1 ] = 5 ;

t(3) = [ 2*(3) + 1 ] = 7 ;

Sum of the first three terms = t(1) + t(2) +t(3) = 3 + 5 + 7 = 15 .