The product of digit is a Factor of a two digit number. Number of such digit are:  Answers.
A) 33
B) 18
C) 19
D) 17
E) 11
Let the number be xy. So 10x+yxy=k10x+yxy=k. Here k is some interzer.   ⇒⇒ 10x + y = kxy   ⇒⇒ x(10 - ky) = - y   ⇒⇒ x(ky - 10) = y   So x is a factor of y. The possibilities are,   11, 1×1=1; 12 , 1×2=2; 15 ,1×5=5; 24 ,2×4=8; 36 , 3×6=18   Answer:18
<result>B</result>
The product of digit is a Factor of a two digit number. Number of such digit are: