Question

Let X = {5, 10, 15, 20, 25, 30, 35, 40}.
Define a relation
on X as follows. ... See Screenshot :)

Answer 1

@amistre64

Answer 2

the "rule" for the relation on the set is just saying:

a |= b if and only if, b = a+10 or b=a+25

Answer 3

there are many pairs of (a,b) in the set X that do not fit the defined relation ...

Answer 4

so, one answer could be (5,10) ?

Answer 5

correct

5+n = 10 , since n is neither 10 nor 25, then that is an incompatable pair

Answer 6

thank you sir :))) u are so helpful!

Answer 7

youre welcome