Express A= {x/x=3n,n<6,n€W} in Roster form?
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Answer:
x=3n
where n is a natural number and n<8
So, n can be any digit from 1,2,3,4,5,6,7
So, in roster form
A={3,6,9,12,15,18,21}
Cardinal number = no. of distinct elements in the Set=7
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