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1 .Daca a1=2 a2=4 ,calculati s10
2 .Calculati 1+11+21+31+............+111
3 . :- 1,5,9,13 ........
Aflati ratia R,a20,s20
4 .a1=2 , r=3, calculati s25 si s50.
5. a1= -3, a4=7
Aflati R , S15, S20
VA ROG RAPID AM NEVOIE !! DAU COROANA