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Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 145
/
3
/
a
/
Solution
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Past exam of the mathematics course of the University of Cambridge
2026
iii
Paper 145
3
a
2026-09-24
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A
nonempty
Dyck path
decomposes uniquely
as
an up-step,
a
Dyck path
,
a
down-step, and another
Dyck path
. Marking each matched outer
pair
by
x
gives
C
(
x
)
=
1
+
x
C
(
x
)
2
.
(1)
The solution with
constant term
one is
C
(
x
)
=
2
x
1
−
1
−
4
x
.
(2)
Solved by
gpt-5
.
6
-sol high.
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(11)
a
3
Paper 145
iii
2026
Past exam of the mathematics course of the University of Cambridge
Mathematics course of the University of Cambridge
Course of the University of Cambridge
University of Cambridge
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