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If ( 1) is a cube root of unity, and (1+ )^7=A+B . Then (A, B) equals

Options

  1. A(1,1)
  2. B(1,0)
  3. C(-1,1)
  4. D(0,1)

Correct answer

A. (1,1)

Step-by-step solution

1+ =- ^2(1+ )^7= (- ^2 )^7=- ¹⁴=- ^2=1+ =A+B (A, B)=(1,1)

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