Let k ˆ 7 j ˆ i ˆ 4 b , k ˆ 2 j ˆ i ˆ 3 a + + = − + = and k ˆ 4 j ˆ 3 i ˆ c + − = be three vectors. If a vectors p satisfies b c b p × = × and a . p = 0, then ( ) k ˆ j ˆ i ˆ . p − − is equal to

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Let k ˆ 7 j ˆ i ˆ 4 b , k ˆ 2 j ˆ i ˆ 3 a + + = − + = and k ˆ 4 j ˆ 3 i ˆ c + − = be three vectors. If a vectors p satisfies b c b p × = × and a . p = 0, then ( ) k ˆ j ˆ i ˆ . p − − is equal to

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