Answer with Step-by-step explanation:
We are given that A and B are two countable sets
We have to show that if A and B are countable then
is countable.
Countable means finite set or countably infinite.
Case 1: If A and B are two finite sets
Suppose A={1} and B={2}
={1,2}=Finite=Countable
Hence,
is countable.
Case 2: If A finite and B is countably infinite
Suppose, A={1,2,3}
B=N={1,2,3,...}
Then,
={1,2,3,....}=N
Hence,
is countable.
Case 3:If A is countably infinite and B is finite set.
Suppose , A=Z={..,-2,-1,0,1,2,....}
B={-2,-3}
=Z=Countable
Hence,
countable.
Case 4:If A and B are both countably infinite sets.
Suppose A=N and B=Z
Then,
=
=Z
Hence,
is countable.
Therefore, if A and B are countable sets, then
is also countable.
Identify the x-value in the ordered pair and plug it into the equation. When you simplify, if the y-value you get is the same as the y-value in the ordered pair, then that ordered pair is indeed a solution to the equation.
27/4
4*6=24
27-24=3
remainder is 3
The cash payment for the article is RS. 2,260.
A discount reduces the price of an item. The article becomes cheaper after the discount.
Cost of the article after the RS. 20 discount = RS. 2020 - 20 = RS 2000
VAT means value added tax. VAT increases the price of an item. The cost of the article increases by 13% after the VAT is levied,
Cost of the article = (100 + 13%) x 2000
1.13 x 2000 = RS 2,260.
To learn more about taxes, please check: brainly.com/question/25311567