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The lines ax + by + c = 0, bx + cy + a = 0 and cx + ay + b = 0 are concurrent if

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The lines ax + by + c = 0, bx + cy + a = 0 and cx + ay + b = 0 are concurrent if 

(a) a + b + c = 0

(b) a2 + b2 + c2 = ab + bc + ca

(c) a3 + b3 + c3 = 3abc

(d)  a2 + b2 + c2 = 2(ab + bc + ca)

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Best answer

Correct option (a),(b),(c)

Explanation :

The three lines are concurrent if 

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