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Prove that , |{:(1+a1," "1," "1),(" "1...

Prove that ,
`|{:(1+a_1," "1," "1),(" "1,1+a_2," "1),(" "1," "1,1+a_3):}|=a_1a_2a_3(1+(1)/(a_1)+(1)/(a_2)+(1)/(a_3))`

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[expanding by the 1 st row ]
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