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=(1+50)+(2+49)+(3+48)+(4+47)+(5+46)+,,,,,
=51+51+51+51+51+,,,,,,51(jumlah=25)
=51×25
=1.275
semoga bisa membantu
saya juga pernah dapet pr itu jawabannya seperti itu alhamdulilah bener.