Provide an appropriate response.
-$\text { A sequence of rational numbers } \left\{ r _ { n } \right\} \text { is defined by } r _ { 1 } = \frac { 2 } { 1 } \text {, and if } r _ { n } = \frac { a } { b } \text { then } r _ { n } + 1 = \frac { a + b } { a - b } \text {. Find } r _ { 50 } \text {. }$
A) 49
B) 50
C) 2
D) 3

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The Answer of Provide an appropriate response.
-$\text { A sequence of rational numbers } \left\{ r _ { n } \right\} \text { is defined by } r _ { 1 } = \frac { 2 } { 1 } \text {, and if } r _ { n } = \frac { a } { b } \text { then } r _ { n } + 1 = \frac { a + b } { a - b } \text {. Find } r _ { 50 } \text {. }$
A) 49
B) 50
C) 2
D) 3

Provide an Appropriate Response A) 49 B) 50 C) 2 D) 3

Provide an Appropriate Response A) 49
B) 50
C) 2
D) 3