N1, N2, N3, N4, N5, N6, N7 and N8 are eight reference books to be kept on three shelves: lowest, middle or top. The reference books are of four different subjects: Physics, Chemistry, Biology and History two reference books of each subject. No two reference books of same subject are kept on one shelf. Also

I. N1 is above N4 ; N7 is below N2 ; N5 is below N6 and N8 is below N3.

II. Top shelf has no Biology's reference books; middle shelf has no Physics' reference books and lowest shelf has no Chemistry's reference books.

III.  N5 and History's reference books are not together; N8 and Chemistry's reference books are not together; N6 and Physics' reference books are not together; and N2 and Biology's reference books are not together.

Which of the following will not be on the top shelf?

Option 1 - <p><em>N1</em></p>
Option 2 - <p><em>N2</em></p>
Option 3 - <p><em>N3</em></p>
Option 4 - <p>All are on top shelf</p>
2 Views|Posted 7 months ago
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7 months ago
Correct Option - 4
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