Directions for questions: Read the information carefully and answer the questions given below.

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 reference books will always be together?

Option 1 - N8, N5

Option 2 - N4, N8

Option 3 - N4, N7

Option 4 - N6, N7

6 Views|Posted 7 months ago

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Answered by

Payal Gupta | Contributor-Level 10

7 months ago

Correct Option - 3

Detailed Solution:

(N4, N7, N5, N8) will be in middle or the lowest shelf.

Note that any reference book of one subject can be absent from only one shelf.

N2 and Biology reference book are not on one shelf

N2 is on top shelf.

Similarly N6 and N8 are on middle and the lowest shelves respectively.

N5 and History reference bo

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Directions for questions: Read the information carefully and answer the questions given below.

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From the 1st statement: B2 is now as old as B3 was in the past. Hence B2 is younger to B3 or B2 < B3. Also sometime in the past B1 was twice as old as B4. So B1 is elder to B4 or B1 > B4. B3 will be as old as B5 in future, hence B3 < B5. The second statement suggests: B1 > B6. B1 was as old as B7 in the past. Hence B1 > B7. B4 will be as old as B6 in future. Hence B6 > B4. B6 will be as old as B7 now in future. Hence B7 > B6

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According to the information provided following arrangement will be obtained:

(K→ Kerala ; G → Goa ; D → Delhi)

Order according to height								Student	Belong
1	2	3	4	5	6	7	8		K	G	D
×	×	×	×	×	×	×	√	Arun	×	×	√
×	×	√	×	×	×	×	×	Ajit	√	×	×
√	×	×	×	×	×	×	×	Rohan	√	×	×
×	×	×	×	×	√	×	×	Gajraj	×	√	×
×	√	×	×	×	×	×	×	Ronit	×	×	√
×	×	×	×	√	×	×	×	Shubham	√	×	×
×	×	×	×	×	×	√	×	Sweety	×	√	×
×	×	×	√	×	×	×	×	Lovely	×	√	×