: Mod Maths : Homeworks :

Those who weren't present in the class during Mod Maths, please write these down inside your notebook.

*Continue from the previous note*

Number of Sets

The symbol n(A) is used to denote the number of elements in set A.
Example: A {1, 3, 5, 7}

<------->n(A) = 4

Venn diagram: 

Example: 

P = {Prime factors of 30}

a) List all the elements of P

<--> P = { 2, 3, 5 }

b) State n(P) *number of elements; the previous info is not compulsary

<--> n(P) = 3

c) Draw a Venn diagram to represent set P and n(P)

*Do this yourself*

Empty Set

1. Empty or null set is a set which has no elements.

2. Symbol for empty set { } or Ø

Note: {0}  or {Ø}  are not empty sets.

Example:

1. L = {an even prime number}

<>L = {2}

<>L ≠ { }

2. M = {odd numbers which are divisable by 4}

<>M = { } or M = Ø

Example:

1. N is a set of month which begins with the letter C.

<>N = { }

Equal Set

2 sets, A and B are equal if each element in set A is also element in set B and vice versa.

Example:

1. A = { P, O, t}

<>B = { O, t, P}

<>A = B

2. X = {1, 2, 3, 4}

<>Y = { 2, 3, 4, 5}

<>X ≠ Y

Example: 

Find the value of x in the equal sets.

{ 2x, 7} = { 7, 9}

<-->2x = 9

<---> x = 9/2

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:Homeworks:

1. Mod Maths - Will be posted today around 3PM.

2. Add Maths - Page 67, Practice 2; Q1-4. Solve in book 2.

<------------->Page 68, Chapter Review Ex; Q2 and Q3. Again, in book 2.

3. BM - Page 41, Pemahaman section. Answer in Penulisan book.

<------> Ameer, see me at school today after Gerko. You left your book at class.

:Notices:

I'll be posting the exercises tomorrow so, look forward to it. I have my reason not to post it now but it's irrelevant, so I won't say anything about it.