In an electric circuit, two resistors with resistances D and E are connected in parallel. In this case, if F is the combined resistance of these two resistors, then the reciprocal of F is equal to the sum of the reciprocals of D and E. What is F in terms of D and E?	Choose the correct choice:
A) DE/(D + E)
B) (D+E)/DE
C) DE
D) D-E
E) NONE OF THESE
The wording is a bit confusing, though basically we are told that 1/F= 1/D + 1/E, from which it follows that F=DE/(D + E).   DE/(D + E)nswer: DE/(D + E)
<result>A</result>
In an electric circuit, two resistors with resistances D and E are connected in parallel. In this case, if F is the combined resistance of these two resistors, then the reciprocal of F is equal to the sum of the reciprocals of D and E. What is F in terms of D and E?