If CD represents a positive two digit number, where C and D are single digit integers, which of the following cannot be true?  Choices.
A) C+D =9  B) (C)(D)=9  C) C-D = 9  D) D-C= 9  E) C/D = 9
(A) CD = 45 or 63 or 27   (B) CD = 33 or 19   (C) 90   (D) impossible   (E) CD = 91   (D) is impossible because 09 is not a valid two digit number --- if there's a zero in the ten's place, that's just 9, a single digit number. Therefore, no valid two digit number would satisfy (D).   ans B)(C)(=9
<result>D</result>
If CD represents a positive two digit number, where C and D are single digit integers, which of the following cannot be true?