1.

If n(A × B) = 20 and n(A) = 5, then n(B)______

Answer»

n(axb) = 20

20 = 5xn(B)

n(B) = 20/5

n(B) = 4 

n(A) = 5, n(A x B) = 20

⇒ n(A) n(B) = 20 (\(\because\) n(A x B) = n(A). n(B))

⇒ n(B) = \(\frac{20}{n(A)}=\frac{20}5=4\)


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