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=100 (2 + 199)
= 100 ( 201 )
= 20100
(pakai rumus deret aritmatika)
smoga jwbnku bnar... :)
Sn = n/2 (2a + (n-1)b)
-------------xakhir
2
1+200
--------x200
2
201/2x200 =20100
atau
bisa jga awal+akhir x 100
(100 di dpt dari 200/2)