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Find values for resistance

Assignment:

Find values for the resistances shown in the circuit below such that the circuit behaves as a difference amplifier with an input resistance of 30 kohms and a gain of 80.

1991_Values for the resistances.jpg
a.    R1=R3 = 10 k, R2=R4 = 1.0M
b.    R1=R3 = 15 k, R2=R4 = 1.0M
c.    R1=R3 = 15 k, R2=R4 = 1.2M
d.    R1=R3 = 17 k, R2=R4 = 1.4M

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