Determine whether the following is valid or invalid:
It's not true that Alberto and John will both attend the meeting.I did learn,however,that if either Susan or Allene goes,John plans to go for sure.Therefore,if Alberto goes,it means neither Susan nor Allene is going.

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The Answer of Determine whether the following is valid or invalid:
It's not true that Alberto and John will both attend the meeting.I did learn,however,that if either Susan or Allene goes,John plans to go for sure.Therefore,if Alberto goes,it means neither Susan nor Allene is going.

Determine Whether the Following Is Valid or Invalid