If n(A×B)=20 and n(A)=5 , then n(B) is_____.
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sorry I don't know this answer
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Formula : n(A) X n(B) = n(A X B)
According to question
n(A X B) = 20, n(A)= 5
n(A) X n(B) = n(A X B)
5 X n(B) = 20
n(B)= 4
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