If Xab = the production of product a in period b, then to indicate that the limit on production of the company's "3" products in period 2 is 400,
a. X32 400
b. X21 + X22 + X23 400
c. X12 + X22 + X32 400
d. X12 + X22 + X32 400
e. X23 400
Period = 2 therefore b=2 for all the products (a=1,2,3)
i.e. we have ...
Answer to a multiple choice question on Constraint in LP formulation.