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Thesum ofthe coefficients inthe expansionof( 1 +x + x ^ 2 )^nis |
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Answer» Solution :Toobtain sum OFCO- efficientsofbinomialexpansion,substitute`X = 1 `intheexpansion `THEREFORE`sumofco -efficient`= (1+ 1+ 1) ^n ` `= 3^n ` |
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