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B = 1 x 1 + 2 x 2 + 3 x 3 + ..... + 98 x 98 [dikurangi]
A-B = 1(2-1) + 2(3-2) + 3(4-3) +......+ 98(99-98)
= 1(1) + 2(1) + 3(1) +.......+ 98(1)
= 1 + 2 + 3 + ............+ 98
A-B = 98/2 x (1+98)
= 49(99)
A-B = 4851