Question

Let

50 n

i i i1 i1

U X U Y 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​

Answer 1

Answer:

30

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