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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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Answer» Each set Xr contains 5 elements and each set Yr contains 2 elements and . If each element of S belongs to exactly 10 of the and to exactly 4 of the then n is (a) 10 (b) 20 (c) 100 (d) 50 |
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