Consider the following statements regarding linear programming:
1. Dual of a dual is the primal.
2. When two minimum ratios of the right – hand side to the coefficient in the key column are equal, degeneracy may take place.
3. When an artificial variable leaves the basis, its column can be deleted from the subsequent Simplex tables.
Select the correct answer from the codes given below:
(a) 1,2 and 3 (b) 1 and 2
(c) 2 and 3 (d) 1 and 3