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Not understand the question properly
It looks like find x from s(x) and y from s(y) and check y<=x

then there are many possible combination of this
as 3<=3,4,5,6,7,10,11,19,18
4<=4,5,6,7,10,11,19,18
5<=5,6,7,10,11,19,18
6<=6,7,10,11,19,18
7<=7,10,11,19,18
10<=10,11,19,18
11<=11,19,18
18<=18,19
19<=19

I'm going to take my stab at rephrasing the formula as it tripped me up to.

It's asking to find an x in S such that any y in S means y <= x.

So, it's asking which element in S is greater than or equal to any other element in S, including itself? This would be 19 because it is the greatest element in the set, therefore it is greater than or equal to all the other elements in the set.

## Databases - Relational Calculus

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Not understand the question properly It looks like find x from s(x) and y from s(y) and check y<=x

then there are many possible combination of this as 3<=3,4,5,6,7,10,11,19,18 4<=4,5,6,7,10,11,19,18 5<=5,6,7,10,11,19,18 6<=6,7,10,11,19,18 7<=7,10,11,19,18 10<=10,11,19,18 11<=11,19,18 18<=18,19 19<=19

total 45 but it is wrong anyone explain plz

I'm going to take my stab at rephrasing the formula as it tripped me up to.

It's asking to find an x in S such that any y in S means y <= x.

So, it's asking which element in S is greater than or equal to any other element in S, including itself? This would be 19 because it is the greatest element in the set, therefore it is greater than or equal to all the other elements in the set.