Page 108 - NUMINO Challenge_D2

Problem solving Key Points

1 Parts A, B, C, and D need to be distinguished First, find the
using four colors. You don’t need to use all the number of ways to
colors, but the adjacent parts need to have color parts, A, B, C,
different colors. How many different ways are and D. Then, use
there to color the snowman? the Multiplication
Principle.

AB
C

D

2 Five parts of the envelope need to be colored First, find the number
of ways to color
using three colors: red, yellow, and blue. You each part of the
envelope.
don’t need to use all the colors, but the adjacent
A
parts need to have different colors. How many BCD E

different ways are there to color the envelope?

105Number of Outcomes