2 + 4 + 6 + 8 + 10. + 96 + 98 (ingenious calculation)

2 + 4 + 6 + 8 + 10. + 96 + 98 (ingenious calculation)

It is found that 2 + 98 = 100
4+96=100
So sum = 100 × 49 △ 2 = 2450