If A={1,3,5,9,18}, then the number of proper subsets of A if(a) 31 (b) 32 (c) 33 (d)25

If A={1,3,5,9,18}, then the number of proper subsets of A if(a) 31 (b)

1.	If A={1,3,5,9,18}, then the number of proper subsets of A if(a) 31 (b) 32 (c) 33 (d)25
Answer» \xa0Let A={1,3,5,9,18} implies O(A)=5Now, number of proper subsets ofA=2O(A)−1=25−1= 32 - 1 = 31