Q. Let, $a_{1} a_{2}, \dots\dots a_{n}$ be a sequence of numbers such that $0 \leq a_{n} \leq 1$ and $a_{n} - 2 a_{n + 1} + a_{n + 2} \geq 0$ for $n = 1, 2, 3 \dots\dots$ Then, range of $(n + 1) (a_{n} - a_{n + 1})$ is

261 121 Sequences and Series Report Error

A

$(- 2, 2)$

B

$[0, 2)$

C

$(- 2, 0]$

D

None of these

Solution:

Correct answer is (b) $[0, 2)$