Question 1081534
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The number of subsets is {{{2^3}}} = 8 in this case, including the empty set and the subset coinciding with {3,4,5} (so called "improper subset").



The number of subsets of a finite set consisting of "n" elements is {{{2^n}}}.



See the lesson 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/word/misc/How-many-subsets-are-there-in-a-given-finite-set-of-n-elements.lesson>How many subsets are there in a given finite set of n elements?</A>

in this site.