The number of proper subsets of the set { 1, 2 , 3 } is :

- a)7
- b)5
- c)6
- d)8

Correct answer is 'A'. Can you explain this answer?

Related Test: Test: Set Notations

10 Answers

Shagun Mehta
answered
Apr 28, 2020

Always remember the formula for finding proper set is 2^n -1 where n is no. of elements

Khaja Moinuddin
answered
3 days ago

A proper subset is all subsets possible for a given set excluding the set itself so the traditional formula reduces to 2^(n)-1...so the answer for this question is 2Â³-1=7

Amit Gulbhile
answered
yesterday

Proper subsets of any set A={m} are 2^m-1.

so proper subsets of set having 3 elements are 2^3-1=7

so the answer is option A

so proper subsets of set having 3 elements are 2^3-1=7

so the answer is option A

Supriya Singh
answered
May 27, 2020

{1,2,3},{1,2},{2,3},{3,1},{1},{2},{3},{}

always remember an empty set is a subset of every set.

always remember an empty set is a subset of every set.

Ac Gupta
answered
2 weeks ago

Because no of subset is 2m, which is here 8 but in includes set it self which is not proper subset. So 7 is subset.

This discussion on The number of proper subsets of the set { 1, 2 , 3 } is :a)7b)5c)6d)8Correct answer is 'A'. Can you explain this answer? is done on EduRev Study Group by JEE Students. The Questions and
Answers of The number of proper subsets of the set { 1, 2 , 3 } is :a)7b)5c)6d)8Correct answer is 'A'. Can you explain this answer? are solved by group of students and teacher of JEE, which is also the largest student
community of JEE. If the answer is not available please wait for a while and a community member will probably answer this
soon. You can study other questions, MCQs, videos and tests for JEE on EduRev and even discuss your questions like
The number of proper subsets of the set { 1, 2 , 3 } is :a)7b)5c)6d)8Correct answer is 'A'. Can you explain this answer? over here on EduRev! Apart from being the largest JEE community, EduRev has the largest solved
Question bank for JEE.

Ask a question

- What are Proper Fractions?
Video | 01:59 min

- Plz explain
Doc | 1 Page

- What is Journal Proper?
Video | 06:04 min

Upgrade to Infinity