Question

For the sequence $\left\{a_n\right\},a_1=2a_{n+1}=1-\frac{1}{a_n}$ for $n\ge 1$ Let $P_n$ be the product of its first $n$ terms, then the value of $P_{2009}$ can be

• A. $-\frac{1}{2}$
• B. -1
• C. $\frac{1}{2}$
• D. 1

Answer 1

Answer: (B)

Correct answer is (b) -1