Task 5
Задача
Three segments are given on the number line: P = [15, 30], Q = [5,10] and R=[10,20]. Choose a segment A such that the formula
( (x ∈ P) → (x ∈ < em>Q) ) /\ (x ∉ A) /\ (x ∈ R)
is identically false, that is, it takes the value 0 for any value of the variable
x.
1) [0, 12] 2) [10, 17] 3) [15, 20] 4)[15, 30]
Выберите правильный ответ, либо введите его в поле ввода
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