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|{:(a+b,2a+b,3a+b),(2a+b,3a+b,4a+b),(4a+...

`|{:(a+b,2a+b,3a+b),(2a+b,3a+b,4a+b),(4a+b,5a+b,6a+b):}|=0`

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The correct Answer is:
`=0 [because ` 2nd and 3rd columns are identical ].
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