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- Let A be a set with n elements where n belongs to w. suppose s do NOT belong to A. Show that A U

- Let A be a set with n elements where n "belongs to "w. suppose s "do NOT belong to" A. Show that A U {s} has n+1 element

- Let A be a set with n+1 elements, where n belong to w. let S belong to A. Show that A/ {s} has n elements

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