Each set X, contains 5 elements and each set Y, contains 2 elements an – InterviewSolution

1.	Each set X, contains 5 elements and each set Y, contains 2 elements and ∪r=120Xr=S=∪r=1nYr. If each element of S belong to exactly 10 of the Xr's and to eactly 4 of Yr's, then find the value of n.
Answer» Each set X, contains 5 elements and each set Y, contains 2 elements and $\cup_{r = 1}^{20} X_{r} = S = \cup_{r = 1}^{n} Y_{r}$ . If each element of S belong to exactly 10 of the X_r's and to eactly 4 of Y_r's, then find the value of n.

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