XAT Scan – 2: If the mechanic selects one faulty machine and one proper working machine then how could he find the faulty from the remaining two machines
With one fine and one faulty he cannot – those are the 4 unsatisfactory cases out of 6….PR, PS, QR, QS.
Managed to evade both the traps only because of the forewarning in XAT Scan 1.
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