1.

The non-zero vectors a, b and c are related by a = 8b and c = - 7b. Then the angle between a and c is

Answer»

`pi`
`0`
`(pi)/(4)`
`(pi)/(2)`

Solution :Since, a = 8B and c = - 7b
`therefore` a is PARALLEL to b and c is anti-parallel to b.
`implies `a and c are anti-parallel
`implies` ANGLE between a and c is `pi`.


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