Question

Se considera multimea A= { x €Z , l 3x l <21. sa se determine numarul de elemente al multimii A

99 puncte

Answer 1

-21<3x<21 ⇔ -7<x<7 ⇒ x∈{-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6}=A
Card A = #A = 13
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