Answer:
2021
Step-by-step explanation:
Compute the numerical value of the expression
(4042 + 4040 + 4038 + … + 6 + 4 + 2) - (4041 + 4039 + 4037 + … + 5 + 3 + 1).
Rearranging the positive and negative terms:
(4042-4041)+(4040-4039)+(4038-4037)+...(2-1)
All the partial subtractions are 1:
1 + 1 + 1 + .... + 1
This sequence is repeated 4042/2=2021 times
