The sum of $$2211+2213+2215+2217+2219+2221+2223+2225+2227+2229$$ is

Solution

There are $$10$$ terms in the arithmetic progression, with first term $$2211$$ and last term $$2229$$. The average is $$\frac{2211+2229}{2}=2220$$, so the sum is $$10\times2220=22200$$.

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