The formula can be written as: (2+100) x100/2/2 = 2550.
Analysis method: 2+ 100= 102.
4+98= 102
6+96= 102……
Because they are all even numbers, a * * * with 100/2 and * * 50 can form a pair equal to 102 and * * 50/2 = 25.
102x25=2550