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Oh ok thanks a lot @jimmysmith560

Just wanted to know whether iron sulfate is unstable?

Just wanted to know whether calcium oxide is toxic?

@quickoats thanks a lot I understand the question now really appreciate it

@quickoats Oh ok, but i still dont quite understand the logic behind the idea of the houses picking their heirs. Like is their a specific reason as to why it must be done like that and was there anything in the question that made you do it in that way? Thanks a lot btw

Its a simple question but I'm having a mindblank, if anyone could quickly explain how to answer this combinatorics question it would be appreciated. I have attached an image of the question below