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यदि ` ( 1 + x + x ^ 2 ) ^n = a _ 0 + a _ 1 x + a _ 2 x ^ 2 + ... + a _ ( 2n ) x ^ ( 2n ) ` , तो सिद्ध कीजिये कि ` a _ 0 + a _ 3 + a _ 6 + ... = 3^( n - 1 ) `

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x की जगह `1, omega , omega ^ 2 ` रखकर जोड़े |

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