1.

Each set X, contains 5 elements and each set Y, contains 2 elements and ⋃20r=2Xr=S=⋃nr=1Yr. If each element of S belongs to exactly 10 of the X′sr and to exactly 4 of Y′sr then find the value of n.

Answer»

Each set X, contains 5 elements and each set Y, contains 2 elements and 20r=2Xr=S=nr=1Yr. If each element of S belongs to exactly 10 of the Xsr and to exactly 4 of Ysr then find the value of n.



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