Question

For a sequence {a_n}, a₁ = 2 and = $\frac { 1 } { 3 }$ . Then is-

• A. $\frac { 20 } { 2 }$[4 + 19 × 3]
• B. 3 $\left( 1 - \frac { 1 } { 3 ^ { 20 } } \right)$
• C. 2(1 – 3²⁰)
• D. None of these

Answer 1

Answer: (B)

3 $\left( 1 - \frac { 1 } { 3 ^ { 20 } } \right)$

Answer 2

= a₁ + a₂ +…..+ a₂₀==3 (1 – 3^–20)