Monday 13 June 2016
What is sets?
= Sets is a collection of distinct object, consider as an object in its own right.
Example 1:
Define each of the following sets by listing its
elements.
(a) The set of the first three months of the
year.
(b)
The sets of the whole numbers less than 2.
(c) The set of letters of the word ‘PAPER’.
Answer:
(a) {January,February,March}
(b)
{0,1}
(c) {P,A,E,R}
*Note on the Question C, we do not repeat the letter P and the sets has 4 element not 5.*
Example 2:
This question is on subsets.
I is the set of integers.
N is the set of natural numbers.
Q is the rational numbers
R is the set of real numbers.
(a) Use the symbol ⊂ to relate I,N,Q,R.
(b)
Draw a venn diagram to represent I,N,Q and R.
Answer:
(a) N⊂I⊂Q⊂R
(b)
Video:
*Note: if there something you wanna ask just leave a comment, thank you! :D*
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ReplyDeleteassalamualaikum, i have some question regarding of this topic may i take your time for you to answer them? this is for my own purpose, thank you.
ReplyDeleteLet A and B be two finite sets such that n(A) = 20, n(B) = 28 and n(A ∪ B) = 36, find n(A ∩ B).
walaikumussalam, sure i would love to help and answer your question, so to answer your question.
DeleteUsing the formula n(A ∪ B) = n(A) + n(B) - n(A ∩ B).
Then n(A ∩ B) = n(A) + n(B) - n(A ∪ B)
= 20 + 28 - 36
= 48 - 36
= 12