Ist method is addition 123+123=246 123+123=246 123+123=246 246+246=492 246+492=738 Your ans is 738 Or IInd method. Is multiply 123x6=738

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738 is the answer and i had answered already it as a comment. simply there are 123  for six times so 123 × 6 = 738
1 5 1
738 because123*6 =738
i too said that one only know