Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This would be 128, I believe. Is this correct?

share|cite|improve this question
    
Provided that you include the empty set and the entire set as subsets, yes. – Brian Tung Jan 26 at 1:03

Yes, I believe it is. For each subset it can either contain or not contain an element. For each element, there are $2$ possibilities. Multiplying these together we get $2^7$ or $128$ subsets.

share|cite|improve this answer

For generalisation the total number of subsets of a set containing n elements is 2 to the power n. And you are surely right.

share|cite|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.