1.

If the centroid of the triangle formed with (a, b), (b, c) and (c, a) is O(0,0), then a3 + b3 + c3 = A) a + b + cB) \(\cfrac{a + b + c}3\)C) \(\cfrac{a b c}3\)D) 3abc

Answer»

Correct option is (D) 3abc

Centroid of triangle whose vertices are \(A(a,b),B(b,c)\;\&\;C(c,a)\) is \((\frac{a+b+c}3,\frac{b+c+a}3)=(0,0)\)         (Given)

\(\Rightarrow\) \(\frac{a+b+c}3=0\)                (By comparing)

\(\Rightarrow\) \(a+b+c=0\)

\(\because\) If \(a+b+c=0,\) then \(a^3+b^3+c^3=3abc\)

Correct option is D) 3abc



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