S25=(2a1+24d)*25/2=
=(2*5+24*3)*25/2=
=(10+72)*25/2=
=(82*25)/2=41*25=1025
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S25=(2a1+24d)*25/2=
=(2*5+24*3)*25/2=
=(10+72)*25/2=
=(82*25)/2=41*25=1025