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If the vecotrs a hat(i) + hat(j) -2 hat(...

If the vecotrs `a hat(i) + hat(j) -2 hat(k) and -12 hat(i) + 4hat(j) + 8 hat(k)` are perpendicular then the value of a is equal to

A

`-1`

B

12

C

`-3`

D

3

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KCET PREVIOUS YEAR PAPERS-KARNATAKA CET 2001-Mathematics
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