1.

If a2 + b2 + c2 = 16, x2 + y2 + z2 = 25 and ax + by + cz = 20, then the value of \(\frac{{a + b + c}}{{x + y + z}}\)

A. 3/5
B. 5/3
C. 4/5
D. 5/4
Answer» D. 5/4


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