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Solution


Q.

If A={x:x=4n+1, 2≤n≤5, n∈N}, then number of subsets of A is
1 8  
2 15  
3 4  
4 16  

Ans.

(4)

Given that,

A={x:x=4n+1, 2≤n≤5, n∈N}={9,13,17,21}

∴  Number of elements in A is 4.

So, number of subsets=24=16