The vectors 2overset(hat)i + 3 overset(h...

The vectors `2overset(hat)i + 3 overset(hat)j-4overset(hat)kand aoverset(hat)i + boverset(hat)j - coverset(hat)(k)` are perpendicular if

a = 2, b = 3, c = 4

a = 4, b = 4, c = 5

a = 4, b = 4, c = -5

none of these

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