A)3,300
B)8,000
C)969
D)1,939

Multiple Choice

$$\text { If } R _ { t } = \frac { R _ { 1 } R _ { 2 } } { R _ { 1 } + R _ { 2 } } , \text { where } R _ { 1 } = 3,300 \text { and } R _ { 2 } = 4,700 , \text { then } R _ { t } =$$

A) 3,300
B) 8,000
C) 969
D) 1,939