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\(P\) and \(Q\) are prime numbers less than \(70\). What is the units digit of \(P*Q?\)
(1) Units’ digit of \((P^{4k+2}−Q)\) is equal to \(7,\) where \(k\) is a positive integer.
(2) Units digit of the expression \([PQ+Q*(Q+1)−Q^2]\) is a perfect cube
Answer:E
Source: e-GMAT
(1) Units’ digit of \((P^{4k+2}−Q)\) is equal to \(7,\) where \(k\) is a positive integer.
(2) Units digit of the expression \([PQ+Q*(Q+1)−Q^2]\) is a perfect cube
Answer:E
Source: e-GMAT
