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Problem
Problem
If
f
(
g
(
x
)
)
=
g
(
f
(
x
)
)
=
x
f(g(x)) = g(f(x)) = x
f
(
g
(
x
))
=
g
(
f
(
x
))
=
x
for all real number
x
x
x
, and
f
(
2
)
=
5
f(2) = 5
f
(
2
)
=
5
and
f
(
5
)
=
3
f(5) = 3
f
(
5
)
=
3
, then the value of
g
(
3
)
+
g
(
f
(
2
)
)
g(3) + g(f(2))
g
(
3
)
+
g
(
f
(
2
))
is (a) 7 (b) 5 (c) 3 (d) 2
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