Question : A and B are positive integers. If A + B + AB = 65, then what is the difference between A and B (A, B < 15)?

Option 1: 3

Option 2: 4

Option 3: 5

Option 4: 6

Question : In $\Delta ABC$, two points $D$ and $E$ are taken on the lines $AB$ and $BC,$ respectively in such a way that $AC$ is parallel to $DE$. Then $\Delta ABC$ and $\Delta DBE$ are:

Option 1: Similar only if $D$ lies outside the line segment $AB$.

Option 2: Congruent only if $D$ lies outside the line segment $AB$.

Option 3: Always similar.

Option 4: Always congruent.