Schweser - AIM 61.1 not answered /wrongly done..

Market risk / Science of Term structure - Sch book 3 Can someone look in to AIM 61.1 for schwerser and see if they answered it properly. BT and Core curriculum puts the argument and tries to tell the discounted pricing is wrong. and proved it with bond arbitrage. But Schw showed backward induction and nothing else… Gurus out there please explain.