Find a formula for ∑ni=1i(i+1) and prove that it holds for all n≥ 1.
For this induction problem I chose i=n+1 so we have (n+1)(n+1+1)=(n+1)(n+2). Is that what we suppose to get for this problem?
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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