From Wikipedia, the free encyclopedia. This is a list of named alloys grouped alphabetically by base metal. Within these headings, the alloys are also grouped alphabetically. Some of the main alloying elements are optionally listed after the alloy names. 1 Alloys by base metal.
Best Answer: Hi kgwefkgwe. The number of subsets of n elemnets = 2^n. but this also includes a null set, because a null set is a subset of every set. So in our problem = 2^6 -1 = 63 subsets.
Even in this case, you are selecting 2 elements from 12 elements. To find out how many distinct selections of these types can be made, we find the combinations (and not the permutations). How many subsets with 3 elements exist? Total elements with utmost 3 elements = 1 + 12 C 1 + 12 C 2 + 12 C 3.