Page 150 - NUMINO Challenge_C2
P. 150
3 Monday Tuesday Wednesday Thursday Friday Saturday Sunday 2 The unluckiest case is when there are two
4 The unluckiest case is when there are two arrows thrown into each basket. When one more
students that have the same birthday on each arrow is thrown, there will be one basket with
day of the week. When there is one more three arrows in it. Therefore, Jim needs to throw
student, then there are three students that have at least 6 1 7 arrows.
the same birthday. Therefore, at least
(7 2) 1 15 students are needed. 3 The unluckiest case is when the six chalks are of
Problem solving two different colors. When another chalk is
picked, there will be three chalks that are the
1 There are 12 months in a year. In order to have same color. Therefore, you must pick at least
6 1 7 chalks.
only two friends whose birthdays are in the
same month, there must be at least one friend's 4 The unluckiest case is when all other types of
birthday in every month. Therefore, if one
friend's birthday is in the same month as cards are picked before the card with shape.
another friend's birthday, their birthdays will be When the remaining 2 cards with shape are
in the same month. Therefore, David has at least picked, 2 of each card are picked. Therefore,
12 1 13 friends. the magician needs to remove at least
5 4 5 2 16 cards.
2 If the bakery sells four cakes every day, then
6 Truth and Lies p.50~p.51
7 4 28 cakes are sold each week. When one
more cake is sold, then there is at least a day Example true, honest, incorrect
where five cakes are sold. Therefore, the bakery true, false, dishonest, correct
sells at least 28 1 29 cakes. old man
Example contradictory, contradictory
, , , , true, false
Tim
Creative Thinking p.48~p.49
1 The unluckiest case is when all 12 classmates Type 6-1 The Gambler p.52~p.53
have different zodiac signs. When one classmate 1 If you assume that Jim's prediction of Korea in
who has the rat, tiger, dragon, sheep, monkey, the 2nd place is true, then his prediction of Italy
or dog sign is selected, 2 classmates with the in the 1st place is wrong.
same zodiac sign are selected. Therefore, Andy Since you assumed that Korea is in the 2nd place,
must select at least 12 1 13 students. then Steven's prediction of Korea in the 4th place
is wrong, but that China is in the 2nd place is
true. But then, China and Korea will both be in
the 2nd place; therefore, there is a contradiction.
Answer Key
4 The unluckiest case is when there are two arrows thrown into each basket. When one more
students that have the same birthday on each arrow is thrown, there will be one basket with
day of the week. When there is one more three arrows in it. Therefore, Jim needs to throw
student, then there are three students that have at least 6 1 7 arrows.
the same birthday. Therefore, at least
(7 2) 1 15 students are needed. 3 The unluckiest case is when the six chalks are of
Problem solving two different colors. When another chalk is
picked, there will be three chalks that are the
1 There are 12 months in a year. In order to have same color. Therefore, you must pick at least
6 1 7 chalks.
only two friends whose birthdays are in the
same month, there must be at least one friend's 4 The unluckiest case is when all other types of
birthday in every month. Therefore, if one
friend's birthday is in the same month as cards are picked before the card with shape.
another friend's birthday, their birthdays will be When the remaining 2 cards with shape are
in the same month. Therefore, David has at least picked, 2 of each card are picked. Therefore,
12 1 13 friends. the magician needs to remove at least
5 4 5 2 16 cards.
2 If the bakery sells four cakes every day, then
6 Truth and Lies p.50~p.51
7 4 28 cakes are sold each week. When one
more cake is sold, then there is at least a day Example true, honest, incorrect
where five cakes are sold. Therefore, the bakery true, false, dishonest, correct
sells at least 28 1 29 cakes. old man
Example contradictory, contradictory
, , , , true, false
Tim
Creative Thinking p.48~p.49
1 The unluckiest case is when all 12 classmates Type 6-1 The Gambler p.52~p.53
have different zodiac signs. When one classmate 1 If you assume that Jim's prediction of Korea in
who has the rat, tiger, dragon, sheep, monkey, the 2nd place is true, then his prediction of Italy
or dog sign is selected, 2 classmates with the in the 1st place is wrong.
same zodiac sign are selected. Therefore, Andy Since you assumed that Korea is in the 2nd place,
must select at least 12 1 13 students. then Steven's prediction of Korea in the 4th place
is wrong, but that China is in the 2nd place is
true. But then, China and Korea will both be in
the 2nd place; therefore, there is a contradiction.
Answer Key
