Interfacing to the Analog World

Q1:
What is the output voltage of the given circuit if the inputs are as follows:
2⁰ = 1, 2¹ = 1, 2² = 0, 2³ = 0?

A –3.115 volts

B –2.8025 volts

C –1.875 volts

D –1.24 volts

ANS:C - –1.875 volts

If this is the right solution for this but I consider the the binary zeros on the above figure as active so it will be:.

-5(1/2^2 + 1/2^3) = -1.875.

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