# If a and b be two sequences given by a(n) = (x)^(1/2^n) + (y)^(1/2^n) b(n) = (x)^(1/2^n) - (y)^(1/2^n) for all natural n. Then a(1)*a(2)*a(3)*...*a(n) = 1. x - y 2. (x + y)/b(n) 3. (x - y)/b(n) 4. xy/b(n)

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