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= πβ1
π=0
β
π1
πβππ§βπ = πβ1
π=0
β
ππ§βπ
πβπ= πβ1
π=0
β
ππ§
π
βπ
= πβ1 0 + 1π§
π
β1
+ 2π§
π
β2
+ 3π§
π
β3
+ 4π§
π
β4
+β―
= πβ1 1π§
π
β1
+ 2π§
π
β2
+ 3π§
π
β3
+ 4π§
π
β4
+β―
= πβ1π§
π
β1
1 + 2π§
π
β1
+ 3π§
π
β2
+ 4π§
π
β3
+β―
= πβ1π§
π
β1 1
1 βπ§π
β1 2= πβ1
π§β1
πβ11
1 βπ§π
β1 2=
π§β1
1 β ππ§β1 2
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