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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

the first question cannot be complete

thefirstquestioncannotbecomplete

Answered by mr W last updated on 06/Oct/19

Q1:   i don′t understand the question.    Q2:  one−digit numbers: X  ⇒9 numbers  two−digit numbers: XY  ⇒9×9=81  three−digit numbers: XYZ  ⇒9×9×8=648    totally: 9+81+648=738 numbers

Q1:idontunderstandthequestion.Q2:onedigitnumbers:X9numberstwodigitnumbers:XY9×9=81threedigitnumbers:XYZ9×9×8=648totally:9+81+648=738numbers

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