01. Show that the rearrangement series is converge and find its sum
1 1 1 1 1 1 1 1 1
1 + --- + --- - --- - --- + --- + --- + --- - --- - --- ...
3 5 2 4 7 9 1 1 6 8
02. n屬於N
1 1 1 1 1 1
1 - --- + --- - --- + --- - --- +...- ---- = ??
2 3 4 5 6 2n
n+1 1
且利用上式球 Σ(-1) --- 之和
n+1
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