Answer:
R =
{(x, y) : x and y have same number of pages}
Reflexive
: As a and a have the same number of pages
is reflexive.
Symmetric
: (a, b)
and b have the
same number of pages
b and a
have also the same number of pages
(a, b)
R and (b, a)
R is
symmetric.
Transitive
: (a, b)
and
b have the same number of pages.
(b,
c)
and c have the
same number of pages
have the same
number of pages
is transitive.
Hence
R is an equivalence relation.
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