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there are four ships sailing on the sea of an infinite Watery planet with a plane surface. Assume that the ships are made of air And one can pass through another without disturbing its motion. Suppose The ships sail in straight lines and five of the six possible "collisions" are Known to happen. What else can you say about this situation? Specifically, will the Sixth collision occur, not occur, or does it depend on something else?

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Four persons A, B, C and D are playing cards. Each person has one card, laid down on the table below him, which has two different colours on either side.
There are 2 red, 2 green and 2 blue. The colours visible on the table are Red, Green, Red and Blue.
They see the color on the reverse side and give the following comment.

A. Yellow or Green
B. Neither Blue nor Green
C. Blue or Yellow
D. Blue or Yellow

Given that out of the 4 people, 2 always lie find out the colours on the cards each person. Given two billion distinct points on a plane such That no three are collinear. I color any half of them red and the Remaining blue. Is it always possible for you to join each red point to one (and Only one) blue point by means of line segments such that no two line segments Intersect?