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If the lines" "ax+ky+10=0,bx+(k+1)y+10=0...

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

A

a,b,c are in GP

B

a,b,c, are in HP

C

a,b,c are in AP

D

`(a+b)^(2)=c`

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The correct Answer is:
C
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