Page 159 - NUMINO Challenge_B2

Answer
Key

Number of Outcomes Problem solving

10 Euler Trail p.86~p.87 1 Each shape has four odd-points. To make one-

Example 4, impossible 2, possible line drawing possible, there should be zero or
2, possible 0, possible two odd-points. Therefore, remove one line that
connect two odd-points.

TryItAgain There are zero odd-points; therefore, one- Answers will vary.
line drawing is possible.
2

Example A

CD There are six There are There are
odd-points. four odd- zero odd-
B One-line points. One- points. One-
A drawing is line drawing line drawing
impossible. is impossible. is possible.

CD

B Type 10-2 Using All Doors Only Once p.90~p.91
4, impossible

1 Sprouts Roses

Sunflowers DandelionPslant Exhibits

Type 10-1 Applications of One-Line Drawing p.88~p.89 Tulips

1 The one-line drawing is possible when there are Cosmos
zero or two odd-points.
2 Even-Point Even-Point
2
Odd-Point Odd-Point
Even-Point Even-Point

Even-Point

44 4 To make one-line drawing possible when there
are two odd-points, you need to start from an
3 When you connect two odd-points, the two odd-point and finish at an odd-point. Therefore,
odd-points disappear and only two other odd- you need to start from either Sunflowers or
Plant Exhibits and finish at either one of them.
points remain.

Answer will vary.

NUMINO Challenge B2