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Răspuns :

[tex]a)~2+3+3+4+3+5+3+2=25~elevi. \\ b)~3+5+3+2=13~elevi. \\ c)~ \frac{2*3+3*4+3*5+4*6+3*7+5*8+3*9+2*10}{25}= \frac{165}{25} =6,6.[/tex]
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