大师作文网The three distinct points P,Q,and R lie on a line l; the fou
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The three distinct points P,Q,and R lie on a line l; the four distinct points S,T,U,V lie on a different line that is parrallel to line l.What is the toal number of different lines that can be drawn so that each line contains exactly two of the seven points?
我认为是18,可答案是12.我觉得我是对的
我认为 s t,su ,sv....这样两两组合也可以啊
我认为是18,可答案是12.我觉得我是对的
我认为 s t,su ,sv....这样两两组合也可以啊
是12啊
很简单的乘法原理,原两条线中各取一点,即3x4=12
按楼主的说法,在同一线上取两点的话,那么这重合的第三条线不可能 contains “exactly two” of the seven points,（线上至少有3或4点）
很简单的乘法原理,原两条线中各取一点,即3x4=12
按楼主的说法,在同一线上取两点的话,那么这重合的第三条线不可能 contains “exactly two” of the seven points,（线上至少有3或4点）
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