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(a) If n(A) = 6 and n(AxxB)=42 then find...

(a) If `n(A) = 6` and `n(AxxB)=42` then find `n(B)`
(b) If some of the elements of `A xx B` are `(x,p),(p,q), (r,s)`. Then find the minimum value of `n(A xx B)`.

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