Sets and Set Operations

Cara ujian sebenarnya menguji konsep ini

Soal dari ujian CSCA sebenarnya yang menguji konsep ini. Kerjakan sendiri dulu sebelum membuka jawabannya.

1. CSCA Math December 2025 Past Paper
   If $A=\{1,2\}$ and $B=\{1,2,3\}$, then ( ).
   • A．$B \subseteq A$
   • B．$A \in B$
   • C．$A \subseteq B$
   • D．$A=B$
   Lihat jawaban & pembahasan

   Jawaban: C

   Answer: C All elements of $A$ are contained in $B$, so $A\subseteq B$. Choose C.
   Lihat di CSCA Math December 2025 Past Paper lengkap
2. CSCA Math January 2026 Past Paper
   Let $A=\{6,7,8,9,10\}$ and let $\varnothing$ denote the empty set. Which statement is correct?
   • A．$9\in A$
   • B．$\{6\}\in A$
   • C．$6\subseteq A$
   • D．$\varnothing\in A$
   Lihat jawaban & pembahasan

   Jawaban: A

   Answer: A The elements of $A=\{6,7,8,9,10\}$ are numbers. Thus $9\in A$ is true. The object $\{6\}$ is a set, not the number 6 itself, so $\{6\}\notin A$. The number 6 is not a set, so $6\subseteq A$ is not valid. The empty set $\varnothing$ is not listed as an element of $A$. Therefore only A is correct.
   Kerjakan CSCA Math January 2026 Past Paper lengkap — berwaktu & dinilai
3. CSCA Math March 2026 Past Paper
   Let $M = \{ x \mid - 5 \leq x < 2 \}$ and $N = \{ x \mid - 4 \leq x \leq 2 \}$. Then $M \cap N =$
   • A．$[ - 4,2 )$
   • B．$( - 5,2 )$
   • C．$[ - 5,2 ]$
   • D．$( - 4,2 )$
   Lihat jawaban & pembahasan

   Jawaban: A

   The intersection takes the common part: M gives $- 5 \leq x < 2$, N gives $- 4 \leq x \leq 2$. The overlap is $- 4 \leq x < 2$, i.e., [-4, 2).
   Kerjakan CSCA Math March 2026 Past Paper lengkap — berwaktu & dinilai