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Let uuu(i=1)^(50)X(i)=uuu(i=1)^(n)Y(i)=T...

Let `uuu_(i=1)^(50)X_(i)=uuu_(i=1)^(n)Y_(i)=T`, where each `X_(i)` contains 10 elements and each `Y_(i)` contains 5 elements. If each element of the set T is an element of exactly 20 of sets `X'_(i)s` and exactly 6 of sets `Y'_(i)s`, then n is equal to:

A

30

B

15

C

50

D

45

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