Sample Problem Mathematical Set and Discussion Class 7 SMP

Example Problem Mathematical Set - After you have studied the material on the set of mathematics, it helps you to also look at the sample questions and discussion of the set that will be given by the basic mathematical formulas in this article. Studying examples will enthuse you in understanding the material and how to answer questions relating to a subject matter of mathematics.

To be able to answer the practice questions about the set, you must first understand the venn diagram and the basic concepts of the mathematical set. If you already feel the mastery, please refer to the following questions:

Sample and Discussion of the Complete Class Mathematics Grade 7

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Sample Problem 1:

Of the 42 goats that are in the cage belonging to the pack Arman, 30 goats like elephant grass, and 28 goats like grass. If there are 4 goats who do not like the two grasses, how many goats like elephant grass and grass?

Discussion:

to search for it, we use the following set formula:

n AΛB = (n A + n (19 + 90)

n AΛB = (30 + 28) - (42 - 4) ]

n AΛB = 20

Thus, the number of goats who favor both types of grass is 20 tails.

Sample Problem 2:

The seventh grade students of Tunas Mekar High School are 45. each student Choose two types of lessons they like. It is known there are 27 students who like lessons in Mathematics and 26 students like English lessons. While students who do not like the two lessons there are 5 people. Determine the number of students who love English and mathematics lessons and draw the venn diagram.

Discussion:

We search first the number of students who like both lessons:

n AΛB = (n A + n B) - (n S - n X)

n (19 + 90)

]

It can be concluded that:

Students who like mathematics only = 27 - 13 = 14 students

Students who love english (19459015)

So the picture of his venn diagram is:

Sample Problem 3:

In a room there are 150 students who have just graduated from junior high school. It is known there are 75 students choose to enter high school and 63 students choose to enter SMK while there are 32 students who have not made a choice. Then, how many students choose only to enter high school and vocational school only?

Discussion:

Students who choose to enter high school and vocational school are:

n { (N A + n B) - (n S - n X)

n AΛB = (75 + 63) - (

n AΛB = 20 students

Students who choose to enter high school only = 75 - 20 = 55 people

Students choosing to enter SMK course = 63 - 20 = 43 people

Sample Problem 4:

Of the 40 infants, it is known that there are 18 b Ayi who likes to eat bananas, 25 babies love to eat porridge, and 9 babies like both. Then there are how many babies do not like bananas and porridge?

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Discussion:

n AΛB = (n A + n B) - (n S - n X)

9 = 43 - 40 + n X

9 - 3 = n X

n X = 6

]

Example Problem 5:

From a group of athletes it is known that 17 people love soccer, 13 love swimming, and 12 people like both. Try to draw a venn diagram and determine also the total number of the athlete.

Discussion:

The total number of athletes is:

The athlete likes football only: 17-12 = 5 people

Athletes who love swimming only = 13 - 12 = 1 person

The venn diagram is:

So, the total is total Han the athlete is 18 persons

So are some Examples of Problem Mathematical Set and Discussion especially for you who are still sitting in Class 7 SMP. Smoga can help you to better understand about the set material that your teacher taught. The spirit of learning !!

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