Hello! I'm in a Public Systems modeling class and I'm having an issue with a mathematical problem. Here is the problems.

3.1If _i=2,4 A(i) is A(2) + A(3) + A(4), write out the sum: _{i=1,3 0( Xij ).}

3.2 Given that represents a sum and represents a product of n terms, what is the value of /=?