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BITSAT 2009
Exam
BITSAT
Year
2009
Subject
Mathematics
Chapter
Sets and Relations

BITSAT 2009 · Mathematics · Sets and Relations

If (A=\ 1,2,3,4,5\ ), then the number of proper subsets of A is

If (A=\{1,2,3,4,5\}), then the number of proper subsets of AA is

Options

  1. A31
  2. B38
  3. C48
  4. D54

Correct answer

A. 31

Step-by-step solution

Number of proper subsets of A=2n−1A=2^n-1 Given: (A=\{1,2,3,4,5\}) Here n=5n=5 (\therefore) no. of proper subsets =25−1=2^5-1
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