In Figure 2, V1=-4V, V2=+2V and V3=8V, The power supplies of the op-amp are +15V and -15V. What should be the value of R1 in kohms so that Vout is 13V? Omit units. Use 2 decimal places.

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BJT (Bipolar Junction Transistor)

A BJT is a semiconductor device with 3 terminals that consist of a p-n junction diode that can amplify the signal or current. It is a current-controlled device. The three BJT terminals are base, collector, and emitter. The BJT works with the charge carrier, the two type of carriers in the BJT are holes and electrons, the charge carriers flow by the process of recombination. The signal to be amplifier is generally given as the input at the base terminal and an amplified form of it is available at the collector terminal.