#2015_19 Application of Binomial Theorem

Algebra Level 5

If coefficients of \({ x }^{ 20 }\) in \({ (1-x+{ x }^{ 2 }) }^{ 20 }\) and in \({ (1+x-{ x }^{ 2 }) }^{ 20 }\) are respectively \(a\) and \(b\), then:

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