GATE Computer Science (CS) 2021 Shift 2 Solved Paper

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Question : 62 of 65
 
Marks: +1, -0
Consider a Boolean function f(w, x, y, z) such that 
f(w, 0, 0, z) = 1
f(1, x, 1, z) = x + z
f(w, 1, y, z) = wz + y
The number of literals in the minimal sum-of-products expression of f is ______
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