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2021 CHMMC Winter (2021-22)
9
2021-22 Winter Team #9
2021-22 Winter Team #9
Source:
April 17, 2022
number theory
Problem Statement
Find the largest prime divisor of
∑
n
=
3
30
(
(
n
3
)
2
)
\sum^{30}_{n=3} {{n \choose 3} \choose 2}
n
=
3
∑
30
(
2
(
3
n
)
)
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