Answer:
(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. \[\bullet \overline{A\,\,\,\,\,\,\,\,\,\,\,\,\,\,B}\bullet \]
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