Problem #PRU-64548

Problems Calculus Functions of one variable. Continuity Monotonicity, boundedness Algebra Algebraic inequalities and systems of inequalities Quadratic inequalites (several variables)

3.0

Problem

Find the largest value of the expression $a + b + c + d - a b - b c - c d - d a$ , if each of the numbers $a$ , $b$ , $c$ and $d$ belongs to the interval $[0, 1]$ .

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