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Numarul de elemente al multimii
A={x apartine lui N | 13 < x < 27}

Răspuns :

Cristinitza
X= {14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26} Deci : A= {14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26}
x∈{14, 15, 16, ....., 26}⇒A={14, 15, 16, ....., 26}

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