If a2 + b2 + c2 = 16, x2 + y2 + z2 = 25 and ax + by + cz = 20 then the value of $$\frac{{a + b + c}}{{x + y + z}}$$ = ? Options: A . &nbsp$$\frac{3}{5}$$ B . &nbsp$$\frac{4}{5}$$ C . &nbsp$$\frac{5}{3}$$ D . &nbsp$$\frac{5}{4}$$

If a2 + b2 + c2 = 16, x2 + y2 + z2 = 25 and ax + by + cz = 20 then the value of

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