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"Question: 19\nIf \\( a \\times b ^ { - } = c ^ { - } \\times d ^ { - } \\) a \\( ^ { - } \\times c ^ { - } = b ^ { - } \\times d ^ { - } \\) ther\nA) \\( \\left( a ^ { - } - d ^ { - } \\right) \\| \\left( b ^ { - } - c ^ { - } \\right) \\)\nB) \\( \\left( a ^ { - } - b ^ { - } \\right) \\| \\left( b ^ { - } - a ^ { - } \\right) \\)\nD) \\( \\left( a ^ { - } + b ^ { - } \\right) \\| \\left( b ^ { - } + d ^ { - } \\right) \\)"
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