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Question Number 70638 by abdusalamyussif@gmail.com last updated on 06/Oct/19
Commented by MJS last updated on 06/Oct/19
thefirstquestioncannotbecomplete
Answered by mr W last updated on 06/Oct/19
Q1:idon′tunderstandthequestion.Q2:one−digitnumbers:X⇒9numberstwo−digitnumbers:XY⇒9×9=81three−digitnumbers:XYZ⇒9×9×8=648totally:9+81+648=738numbers
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