In question A54 page- 328, I'm getting some different answer. I checked the solution provided, but in solution there is one mistake. It is given y*(y-1)*(y+1)=y^3 - y^2 and according to me it should be y^3-y. Can anybody throw some light on it?
Yeah its a mistake. U're right and correct answer is 420. PS- even it's not an option to question. So better to write a new option E.
I concur. Yes it should be y³ - y and the total is then 420. I'll get this into our corrections document which will be uploaded on our website here by the end of this week. Apologies for the inconvenience caused and thank you so much for letting us know so that we can fix it.
