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Could someone please check my work? If A and B are countable sets such that A = Ear, a2, as,.... 3 and B = 26,,

Could someone please check my work?

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If A and B are countable sets such that A = Ear, a2, as,.... 3 and B = 26,, 62, 63 ,... 3, Show that AUB is also a countable set. Assuming AnBED, so That A and Bare disjoint AUB = Za, , 61, a2, b2, a3, b3,... 5 AUB - AABIAAB+ BAA! When is AnB + 0

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