If A= (1,2,3,4,5), then the number of proper subsets of A is ------
If A= (1,2,3,4,5), then the number of proper subsets of A is ------ Correct Answer 31
আমরা জানি, Proper subset সংখ্যা = 2n - 1 এখানে, n = 5 proper subset সংখ্যা = 25 - 1 = 32 - 1 = 31