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1.Set Theory
medium
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\} $ |
Option A
Option B
Option C
Option D
Solution
Since in $(d),$ there are $9$ letters in the word $PRINCIPAL$ and two letters $P$ and $I$ are repeated, so
$(i)$ matches $(d).$ Similarly, $(ii)$ matches $(c)$ as $x+1=1$ implies $x=0 .$ Also, $1,2,3,6,9,18$ are all divisors of $18$ and so $(iii)$ matches $(a).$ Finally, $x^{2}-9=0$ implies $x=3,-3$ and so $(iv)$ matches $(b).$
Standard 11
Mathematics
