x_n is either -1 or 1 and is greater than or equal to 4; If

x₁x₂x₃x₄ + x₂x₃x₄x₅ + x₃x₄x₅x₆ +........ x_nx₁x₂x₃=0

then find the value of n.

Dear Anushka

Dont post the same question again.

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