Find 'X' in the circuit below : f1(A, B, C, D) = ?(6, 7, 13, 14); f2(A, B, C, D)

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Question
Find 'X' in the circuit below :

f₁(A, B, C, D) = ?(6, 7, 13, 14);
f₂(A, B, C, D) = ?(3, 6, 7);
f₃(A, B, C, D) = ?(5, 6, 7, 14, 15)
Options
A. p(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
B. 0
C. ?(14)
D. 1

Correct Answer

?(14)

Explanation

f₁(A, B, C, D) = ?(6, 7, 13, 14)

f₂(A, B, C, D) = ?(3, 6, 7)

f₁ ? f₂ = ?(3, 13, 14)

f₃ x (f₁ ? f₂) = ?(14) = y

X = f₁ x y ? ?14.

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