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प्रश्न
Multiple Choice Question :
If n(A × B) = 6 and A = {1, 3} then n(B) is ________
पर्याय
1
2
3
6
उत्तर
3
Explanation;
n(A × B) = 6
n(A) = 2
n(A × B) = n(A) × n(B)
6 = 2 × n(B)
n(B) = `6/2` = 3
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