# Please explain Q. If a2 + b2+ c2 = 16, x2 + y2 + z2 = 25 and ax + by + cz = 20, then the value of $\frac{\mathrm{a}+\mathrm{b}+\mathrm{c}}{\mathrm{x}+\mathrm{y}+\mathrm{z}}$

We are neglecting negative value of k , -4/5 from start because option has no negative values.

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