Question

Six straight line are drawn in the plane such that no two lines are parallel and no three lines are concurrent. Then the number of parts into which these lines divide the plane is

• A. 22
• B. 20
• C. 18
• D. 21

Answer 1

The correct option is A 22

$\frac{1}{2}(n^2+n)+1$ (formula)
$\Rightarrow =n=6$
No. of planes is 22.