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calculati a10, a20, a30 din progresia aritmetica
a1=2
R=4​


Răspuns :

a10=a1+9r=2+9×4=2+36=38;

a20=a1+19r=2+19×4=2+76=78;

a30=a1+29r=2+29×4=2+116=118;