KCET 2018 Math Solved Paper

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Question : 9 of 60

Marks: +1, -0

If |

−

a

| and |

−

b

| are mutually perpendicular unit vectors, then
( 3 |

−

a

| + 2|

−

b

| ) · ( 5 |

−

a

| - 6 |

−

b

| ) =

5
3
6
12

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