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1.Set Theory
easy
Which of the following are sets ? Justify your answer.
The collection of all boys in your class.
Option A
Option B
Option C
Option D
Solution
The collection of all boys in your class is a well-defined collection because you can definitely identify a boy who belongs to this collection.
Hence, this collection is a set.
Standard 11
Mathematics
Similar Questions
Match each of the set on the left described in the roster form with the same set on the right described in the set-builder form:
| $(i)$ $\{ P,R,I,N,C,A,L\} $ | $(a)$ $\{ x:x$ is a positive integer and is adivisor of $18\} $ |
| $(ii)$ $\{ \,0\,\} $ | $(b)$ $\{ x:x$ is an integer and ${x^2} – 9 = 0\} $ |
| $(iii)$ $\{ 1,2,3,6,9,18\} $ | $(c)$ $\{ x:x$ is an integer and $x + 1 = 1\} $ |
| $(iv)$ $\{ 3, – 3\} $ | $(d)$ $\{ x:x$ is aletter of the word $PRINCIPAL\} $ |
medium
