1.

Each set Xr contains 5 elements and each set Yr contains 2 elements and ∪r=120 Xr=S=∪r=1n Yr. If each element of S belongs to exactly 10 of the Xr's and to exactly 4 of the Yr's, then n is(a) 10(b) 20(c) 100(d) 50

Answer» Each set Xr contains 5 elements and each set Yr contains 2 elements and r=120 Xr=S=r=1n Yr. If each element of S belongs to exactly 10 of the Xr's and to exactly 4 of the Yr's, then n is

(a) 10

(b) 20

(c) 100

(d) 50


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