$\text { Figure } 6 \text { '1 }$ -If R₁=10

Multiple Choice

$\text { Figure } 6 \text { '1 }$
-If R₁=10 $\mathrm { k } \Omega$ , R₂=15 $\mathrm { k } \Omega$ and R₃=50 $\mathrm { k } \Omega$ in Figure 6-1, RT equals_____

A) 11.5 $\mathrm { k } \Omega$
B) 10 $\mathrm { k } \Omega$
C) 21.5 $\mathrm { k } \Omega$
D) 9.5 $\mathrm { k } \Omega$