In anbn, A1 = 36, B1 = 64, A100 + B100 = 100, then the sum of the first 200 items of anbn is

In anbn, A1 = 36, B1 = 64, A100 + B100 = 100, then the sum of the first 200 items of anbn is

an=a1+(n-1)d bn=b1+(n-1)D
a1=36.b1=64,a100+b100=100
So D + D = 0
If the equal difference of an is D, then the equal difference of BN is - D
The sequence an + BN is an arithmetic sequence with equal difference 0
100*200=20000