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I have quite a lot of problems [like the following] that I can't really wrap my head around so maybe someone could help me out? It'd be great if you could show me how to do it too. Thanks for the help :) 1) Show that 1+2+4+...+2^(n-1) = 2^(n)-1 2) Sn= n^(2)+4n ; find t1, t2, and t3