Question

Find the number of subsets of A if A=(x:x=4n-1:1≤n ≤5)​

Answer 1

the subset of A={x:x=4n-1:1<n<5}

={4(2)-1 ,4(3)-1 ,4(4)-1 ,4(5)-1}

=2{7,11,15,19}

number of subsets A =2^4 =16

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