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Relations and Functions — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsRelations and Functions1 Mark
MCQ
If $A \times B = \{(1, a), (1, b), (1, c), (2, a), (2, b), (2, c)\}$ then find set $A:$
  • A
    $\{1\}$
  • ✓
    $\{1, 2\}$
  • C
    $\{1, a\}$
  • D
    $\{a, b, c\}$
✓

Answer

Correct option: B.
$\{1, 2\}$
In each ordered pair of $A \times B$, first element belongs to set $A$ and second element belongs to set $B.$
$1, 2 \in \text{A}$
so, $\text{A} = {1, 2}.$

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