#2015_19 Application of Binomial Theorem

Algebra Level 5

If coefficients of x20{ x }^{ 20 } in (1x+x2)20{ (1-x+{ x }^{ 2 }) }^{ 20 } and in (1+xx2)20{ (1+x-{ x }^{ 2 }) }^{ 20 } are respectively aa and bb, then:

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