Question

Give the cordinality of each of the ff sets and enumerate its element

1.)the colors of the spectrum(rainbow)
2.)the planets
3.)the sense organs
4.)the counting number less than 10
5.)the multiples of 2 greater than 10 but less than 30

B.Name well-defined set than has exactly

1.)1 element
2.)2 elements
3.)4 elements
4.)7 elements
5.)10 elements

Answer 1

By cardinality it just means "how many objects are in this set?" So just count them :)

Answer 2

how ?! please show to me .. because i don't know

Answer 3

How to count?

Answer 4

yes .. explain it

Answer 5

how many colors are in the spectrum?

Answer 6

One fish, two fish, red fish, blue fish.

Answer 7

im pretty sure there are only eight planets

Answer 8

i don't get it

Answer 9

i am not sure if there are 7 colours of the rainbow or an infinite amount

Answer 10

how about letter b !? please explain it because i don't get it that much

Answer 11

you could have this as your answer to B. 1

stars in our solar system

because that set only has one element -the sun

Answer 12

ah ..... how about number 2??

Answer 13

can you think of a set with only two elements?

Answer 14

what is element?

Answer 15

the element is the thing in the set,

imagine a box of crayons

each particular crayon is an element
and the set is all of the crayons.

Answer 16

ah

Answer 17

if i had three thing to eat for lunch
one element could be a apple,
another element could be a sandwich and the third could be a yam,
We could represent the my lunch as the set
\[\{\text {apple},\text{sandwich},\text{yam}\}\]
this set has three elements

Answer 18

give 2 elements

Answer 19

the result of a coin flip

Answer 20

huh

Answer 21

2 element

Answer 22

result of a coin flip is \(\{\text{heads, tails}\}\)
this is a set with two elements