Question

A is a set of digits in the Ramanujan number. write all the proper subsets of A

Answer 1

we know that ramanujan number is 1729
the subsets of A are Nullset,{1},{2},{7},{9},{1,2},{1,7},{1,9},{1,2,7},{1,2,9},{1,7,9},{1,2,7,9}.
these are the subsets of A