expension of ( 1 - X) ^n
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Heya
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( 1 - x )ⁿ = 1 - nx + n(n-1)/2! -n(n-1)( n-2)/3! + ...+ xⁿ
______________________________
( 1 - x )ⁿ = 1 - nx + n(n-1)/2! -n(n-1)( n-2)/3! + ...+ xⁿ
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