Let A be the set of vectors veca=(a1,a2,...

Let A be the set of vectors `veca=(a_1,a_2,a_3)` satisfying `(sum_(i=1)^3a_i/2^i)^2=sum_(i=1)^3a_i^2/2^i` Then

A is empty

A contains exactly one element

A has 6 elements

A has infinitely many elements

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