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Question

Find the value of (2+w+w2)3(13w+w2)3(13w+w2)3

A
125
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B
126
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C
128
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D
129
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Solution

The correct option is D 129
(2+ω+ω2)3(13ω+ω2)(13ω+ω2)3=13(1+ω23ω)3(1+ω23ω)31(ω3ω)3(ω3ω)3=1+(4ω)3+(4ω)3=1+64ω3+4ω3=129

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