1+3+3^2--- to n th term =3^n-1/2

1.	1+3+3^2--- to n th term =3^n-1/2
Answer» TN = 3^(n-1) SN = 3^0 +3¹ + 3² +... using sum of gp formula Sn = a(r^n -1)/(r-1) Sn = 1(3^n-1)/(3-1) = (3^n - 1)/2

Answer»

TN = 3^(n-1)

SN = 3^0 +3¹ + 3² +...

using sum of gp formula

Sn = a(r^n -1)/(r-1)

Sn = 1(3^n-1)/(3-1)

= (3^n - 1)/2

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1+3+3^2--- to n th term =3^n-1/2

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