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1 + 3+5+7+9+...+99 = x dr angka 1 s/d 99 = 50 buah
99 + 97+ ..............+ 1 = x , jumlahkan
--------------------------------- +
100 + 100 +.........+100 = 2x , krn angka 100 sebanyak 50 buah , maka
50 x100 = 2x
2x = 5000
x = 5000/2 = 2500
jd
1 + 3+5+7+9+...+99 = x = 2500