alleryStart learning →What is the length of the interval (-5, 7]?
- 7
- 2
- 35
- 12
Show answer and solution
Correct answer: D. 12
Length is the upper end minus the lower end, 7 - (-5) = 12.
CBSE Class 11 (Commerce) Sets — practice questions — page 3
Explore 74 free Sets questions in CBSE Class 11 (Commerce) Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Sets with Quill →Sets questions and exercises with answers
Showing questions 61–74 of 74.
What is the length of the interval (-5, 7]?Read the answer and worked solution →Venn diagrams are named after which English logician?Read the answer and worked solution →Hockey: Ram, Geeta, Akbar. Football: Geeta, David, Ashok. How many play at least one?Read the answer and worked solution →If B is a subset of A, then A ∪ B equalsRead the answer and worked solution →Find the intersection of {2, 4, 6, 8} and {6, 8, 10, 12}.Read the answer and worked solution →If A = {1, 2, 3, 4, 5, 6} and B = {2, 4, 6, 8}, find B - A.Read the answer and worked solution →If V = {a, e, i, o, u} and B = {a, i, k, u}, find V - B.Read the answer and worked solution →The sets A - B, A ∩ B and B - A are alwaysRead the answer and worked solution →U is all students of a mixed class and A is all its girls. What is A'?Read the answer and worked solution →For any subset A of U, the complement of A' isRead the answer and worked solution →By De Morgan's law, (A ∪ B)' is equal toRead the answer and worked solution →Within a universal set U, the complement of the empty set isRead the answer and worked solution →In which year did Bertrand Russell show that a set of all sets leads to a contradiction?Read the answer and worked solution →Who published the first axiomatisation of set theory in 1908?Read the answer and worked solution →
Worked practice questions
Venn diagrams are named after which English logician?
- John Venn
- Georg Cantor
- Gottlob Frege
- George Boole
Show answer and solution
Correct answer: A. John Venn
The diagrams carry the name of John Venn (1834 to 1923).
Hockey: Ram, Geeta, Akbar. Football: Geeta, David, Ashok. How many play at least one?
- 5
- 3
- 6
- 4
Show answer and solution
Correct answer: A. 5
The union has Ram, Geeta, Akbar, David and Ashok, with Geeta counted once.
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