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2 + 4 + 6 + .. + 98 = a
98 + 96 + 94 + ... + 2 = a
_______________________ +
100 x 49 = 2a
a = 2450
kelipatan 6:
6 + 12 + 18 + ... + 96 = a
96 + 90 + 84 + ... + 6 = a
_____________________ +
102 x 16 = 2a
a = 816
Jumlah bil asli kurang dr 100 yg habis dibagi 2 tp tdk habis dibagi 6 adalah
2450 - 816 = 1634