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let a={x:x is a natural number<11}
b={x;x is an even number and 1<x<21} c={x:x is an integer and 15less than xless than 25} (1) list the element of A,B,C (2)find n(A), n(B), n(C)

a=10
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a= {1,2,3,4,5,6,7,8,9,10}
b= {2,4,6,8,10,12,14,16,18,20}
c= {...,0,1,2,3,4,5,6,7,8,9,10}
n(a) =10
n(b) =10
n(c) = infinite sets
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Question u have typed is wrong. See pg.17 in ur maths book and check it out.
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What are you looking for?