The values of a, b, c, d are 1, 2, 3 and 4, but not necessarily in that order. What is the largest possible value of the sum of the four products ab, bc, cd and da?
π ππ‘π’π§π€: π, π, π, π =(π*π) + (π*π) + (π*π) + (π*π) = ππ
+981 
