n an integer program we have variables x1,..., xn, all binary.Write down constraints that enforce the following logical conditions:(Think of it as having projects 1,..., n. If xi is 1, that means we undertakeproject 1, and if it is 0 then we do not. To help your understanding, you maywant to rephrase the conditions below in terms of undertaing a project, ornot.)Write an IP constraint to enforce:If we undertake project 1, then we should undertake at most 3 of projects2,...,20.Hint: if we undertake at most 3 of projects 2,...,20, then we do not undertake... of projects 2,...,20,