Expand
a^{20}+167960a^{9}b^{11}+125970a^{8}b^{12}+77520a^{7}b^{13}+38760a^{6}b^{14}+15504a^{5}b^{15}+4845a^{4}b^{16}+1140a^{3}b^{17}+190a^{2}b^{18}+20ab^{19}+b^{20}+167960b^{9}a^{11}+125970b^{8}a^{12}+77520b^{7}a^{13}+38760b^{6}a^{14}+15504b^{5}a^{15}+4845b^{4}a^{16}+1140b^{3}a^{17}+190b^{2}a^{18}+20ba^{19}+184756\left(ab\right)^{10}
Evaluate
\left(a+b\right)^{20}
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