5000-2-4-6… -98-100=______ .

5000-2-4-6… -98-100=______ .

5000-2-4-6… -98-100,=5000-(2+4+6+… +98 + 100), = 5000 - (2 + 100) × 50 △ 2, = 5000-2550, = 2450; so the answer is: 2450