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Hi, I want to buy a 4U textbook. I've heard about a few books( Cambridge, Terry Lee etc). I was wondering if Terry Lee's one is good. Please help me :) Thank you :D

Hi, I'm currently learning BT in class. My math tutor said I have to prove the Double sigma notation before using in HSC. But my school teacher didn't mention anything about it and just taught us to use it just as it is. Does anyone know whether we are meant to prove it \ before using it...