Question

In a GP, fifth term is 4 , then product of first nine terms is –

• A. 9⁴
• B. 4¹⁸
• C. 4⁹
• D. None

Answer 1

Answer: (C)

4⁹

Answer 2

T₁ . T₂ . T₃ . T₅ . T₆. T₇ . T₈ . T₉

= $\frac { 4 } { \mathrm { r } ^ { 4 } } \cdot \frac { 4 } { \mathrm { r } ^ { 3 } } \cdot \frac { 4 } { \mathrm { r } ^ { 2 } } \cdot \frac { 4 } { \mathrm { r } }$ 4 . 4r . 4r² . 4r³ 4r⁴ = 4⁹