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1+3=4
1+3+5=9
1+3+5+7=16
1+3+5+7...49+50.
(49+1)/2
50/2
25
Jadi1+3+5...49+50
25^2+50
B.1-2+3-4+5...
1+(-2+3)+(-4+5)...(-98+99)-100
1+1+1+1(sebanyak (99+1)/2=50).....-100
-50