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Don Mills C.I.
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1
π
=
12
∑
k
=
0
∞
(
−
1
)
k
(
6
k
)
!
(
545140134
k
+
13591409
)
(
3
k
)
!
(
k
!
)
3
640320
3
k
+
3
/
2