$$\binom{n}{c}+ \binom{n}{c+1}= \binom{n+1}{c+1}$$
How can I prove using induction for all values of $n$ and $c$?I have no idea how to start it. Please help!
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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