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Ans:  211

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“n straight lines separate the plane such that no 2 lines are parallel and no 3 lines pass through a common point”

$number\ of\ planes=\frac{\left ( n^{2} +n+2\right )}{2}$

$n=20$

$=\frac{\left ( 20^{2}+20+2 \right )}{2}$

$=211$

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