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If the determinant |[a,b,2a alpha+3b],[...

If the determinant
`|[a,b,2a alpha+3b],[b,c,2b alpha+3 c],[2a alpha+3b,2b alpha+3c,0]|=0` then

A

1)`a, b, c` are in H.P

B

2)`alpha` is a root of `4 a x^2+12 b x+9 c=0` or `a, b, c` are in G.P.

C

3)`a, b, c` are in `G, P` only

D

4)`a, b, c` are in A.P

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The correct Answer is:
B
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