Question Details

For a sequence of real numbers $x_{1}, x_{2}, ..., x_{n}$ , If $x_{1} - x_{2} + x_{3} - x_{4} + ... + {(- 1)}^{n - 1} x_{n} = \frac{n (n + 1)}{2}$ for all natural numbers n, then the sum $x_{49} + x_{50}$ equals

Options

A

200

B

2

C

-200

D

-2

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