A = {integers divisible by 2} and B = {integers}, what is A ∩ B? {...−3, −2, −1, 0, 1, 2, 3 ...} { } {0} {... −6, −4, −2, 0, 2, 4, 6 ...}
A= 2,4,6,8,10 and etc. Right?
\(\large A \cap B\) is the set with elements common to both sets\(\large A\) and \(\large B\)
also include negative numbers and 0 : A = {...,-10,-8,-6,-4,-2,0, 2,4,6,8,10,...}
Ohhh ok
B is all integers : B = {...,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,...}
what elements are common to both the sets ?
in other words what elements exist in both set A and set B ?
-10,-8,-6,-4,0,2,4,6,8,10
Perfect ! but you need to include ALL even integers since both the given sets have infinite elements
\[\large A\cap B = \{\text{all even integers}\}\]
OK so my answer would be?
The last one?
look at the options, which option has all even integers ?
Yup!
... in the end means the list continues forever to infinity
... in the start means the list continues forever to -infinity to left
so last option represents ALL the even integers
Thaanks
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