• # question_answer 4) How many lines can pass through (a) one given point? (b) two given points?

(a) Infinite number of lines can pass through one given point. Let there be a point O on a surface. Now, we can draw infinite lines through it, (b) Exactly one and only one line can pass through two given points (say A and B) i.e. $\bullet \overline{A\,\,\,\,\,\,\,\,\,\,\,\,\,\,B}\bullet$