Question: 1 . 2 . 9 I f a sequence o f sets C 1 , C 2 , C 3 , cdots i s such

1.2.9If a sequence of sets C1,C2,C3,cdots is such that CksupCk+1,k=1,2,3,cdots,
limkCkis defined as the intersection C1C2C3cdots. Find
limkCkif:
(a)Ck={(x,y):0x2+y21k},k=1,2,3,cdots
1 . 2 . 9 I f a sequence o f sets C 1 , C 2 , C 3

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