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Relation — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHSRelation1 Mark
Question
If n(A) = 3, n(B) = 4, then write n(A × A × B).
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Answer

We have, n(A) = 3, n(B) = 4 $\therefore$ n(A × A × B) = n(A) × n(A × B) $\big[\because\ \text{n(A}\times\text{B})=\text{n(A)}\times\text{n}(\text{B})\big]$ = n(A) × n(A) × n(B) = 3 × 3 × 4 = 36 ⇒ n(A × A × B) = 36

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