R) The following proot seems to show that 2-1. Place a check mark In the step In which the error occurs. Step 1: Let a =b a - ab Step 2: Multiply by Step 1 Step 2 a- - ab -h stract Step 4: (a-5)(a+h) - ba-h) Factor Step 3 Step 3 Step 4 (e-ka Ma- - Step 5: Divide by la-) Step 6: a+b=b Simplify Step 5 Step 6 Step 7: b+b=b Step 8: 2h = b Since a=b %3D Simplify Step 7 Step 8 Duido bu

A commuter must travel from Ajax to Barrie and back every day. Four roads join the two cities. The commuter likes to vary the trip as much as posible, so she alwaysleaves and returns by different roads. In how many different ways can she make the round-trip?