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Problem
Problem
Let
f
(
x
)
=
a
x
+
b
f(x) = ax + b
f
(
x
)
=
a
x
+
b
, where
a
a
a
and
b
b
b
are integers. If
f
(
f
(
0
)
)
=
0
f(f(0)) = 0
f
(
f
(
0
))
=
0
and
f
(
f
(
f
(
4
)
)
)
=
9
f(f(f(4))) = 9
f
(
f
(
f
(
4
)))
=
9
, then the value of
f
(
f
(
f
(
f
(
10
)
)
)
)
f(f(f(f(10))))
f
(
f
(
f
(
f
(
10
))))
is equal to (a) 0 (b) 4 (c) 9 (d) 10
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