1.

If the lines ax + ky + 10 = 0, bx + (k + 1) y + 10 = 0 and cx + (k+2)y + 10 = 0 are concurrent, then

Answer»

a, B, C are in G.P.
a, b, c are in H.P
a, b, c are in A.P
`(a + b)^(2) = c`

ANSWER :C


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