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Fill in the blanks in each of the following, using the answers given against each of them :
The lines 2x - 3y + 1 = 0 and 3x+ ky - 1 = 0 are perpendicular to each other if k = _____ .

A

2

B

3

C

`-2`

D

`-3`

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The correct Answer is:
A
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