# 1 : prove : 0 < a="" i="">< 1="" ,="" i="1" ,="" 2="" ,="" ......="" m.="" (="" 1="" -="" a1="" )="" .........(="" 1="" -="" an="" )="">= 1 - a1 - ....... - an. please prove it by induction .
# 2 :
a) how many unbounded regions are formed by n lines in general position in the plane. b): what is the minimum number of regions formed by n different lines in the plane - No restriction. prove it by induction .
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