Eight persons -  A, B, C, D, E, F, G, and H.

Months - January, March, July, and September.

Date - 7^th and 18^th.

1) Two persons attend the seminar between E and C.

2)  E attends the seminar on the month which has 30 days.

3)  F attends the seminar on 7^th March.

4) H attends the seminar immediately after E. This will eliminate case 2.

5) Only one person attend the seminar before B.

6) Number of persons attend the seminar before A is one more than the number of persons attend the seminar after A. 

7) G is not the person who attends the seminar first.

All the given options (D - B, F - C, A - G, and E - H) except (F - G) attend the seminar in the same month. 

Hence, F - G does not belong to the group.

According to the given question,

The pairs are -

1. CE - CDE

2. AE - ABCDE

3. TV - TUV

Hence, There are three pairs.

The best possible Venn diagram is,

Conclusions:

I. Some mocks are local: False (No direct relation between mocks and local, it is possible but not definite))

II.No local is a mock: False (No direct relation between mocks and local, it is possible but not definite))

Conclusion I and II form a complementary pair.

Hence, either I and II follow.

Key Points

Conditions for Either - Or 

1. Subject and predicate should be the same
2. Both the individual conclusions should be false
3. One conclusion should be positive and one conclusion should be negative
4. There should either one of the following pairs present in the conclusions

• All + Some not
• Some + No

The least possible Venn diagram is:

Conclusions:

I. Some Switch are Fan → True (Only a few Fan are Cooler is given which means Some Fan are Cooler and Some Fan are not Cooler, which also states that Some Cooler are Fan, and All Cooler are part of Switch, so the part of Switch which is Cooler is also Fan).

II. Some Bulb are Cooler → True (As, Only a few Bulb are Cooler is given, which means Some Bulb are Cooler and Some Bulb are not Cooler).

III. All Switch are Cooler → False (This is possible but not definite, as we don't know anything about the remaining portion of Switch).

Hence, Both Conclusion I and II follows.

The least possible Venn diagram:

Conclusions:

I. All Best can be Android → False (As, Only Best is Black is given, which means All Black are Best, and Black will not have any positive relationship with any other element except with Best, so if All Best goes inside Android, then All Black also goes inside Android, which violates the statement, so this is definitely false).

II. Some Android is definitely Black → False (As, Only Best is Black is given, which means All Black are Best, and Black will not have any positive relationship with any other element except with Best, so Some Androids are definitely not Black).

III. All Mobiles can be Android → False (As, Some Mobiles are not Android is given, so All Mobiles can never be part of Android, so this is definitely false conclusion and possibility with false conclusion is always false).

Hence, None follows.

The least possible Venn diagram is:

Conclusions:

I. Some Girls are Pretty → False (This is possible but not definite).

II. Some Beautiful are not Bad → True (Some Beautiful are Pretty and No Pretty is Bad, so the part of Beautiful which is Pretty will never be Bad, so this is definitely true conclusion).

III. All Bad being Pretty is a possibility → False (The possibility is false, as Pretty and Bad both have relationship of No with each other).

Hence, Only Conclusion II follows.

The correcrt answer is option 2.

Logic:

First three letters of the word 'COMPREHENSION' are reversed and then last three letters are added 

⇒ MOC ION

Then the remaining letters are reversed and added,

⇒ MOC ION SNEHERP

⇒ MOCIONSNEHERP

Letter will be exactly in the middle

⇒ MOCION S NEHERP

So, S letter will be exactly in the middle.

Seven people - A, B, C, K, L, M, and N

1- K is sitting second to the right of A. 

2- Only two people are sitting between K and L. 

Case-1

Case-2

3- M sits third to the right of N. 

4- N is an immediate neighbor of K and only one person is sitting between L and N. 

5- Only two people are sitting between A and C. 

Case-1

Case-2

6- B is not an immediate neighbor of K. So case-1 gets eliminated.

So, the Final arrangement;

Hence, L is sitting third to the left of K.

Seven people - A, B, C, K, L, M, and N

1- K is sitting second to the right of A. 

2- Only two people are sitting between K and L. 

Case-1

Case-2

3- M sits third to the right of N. 

4- N is an immediate neighbor of K and only one person is sitting between L and N. 

5- Only two people are sitting between A and C. 

Case-1

Case-2

6- B is not an immediate neighbor of K. So case-1 gets eliminated.

So, the Final arrangement;

Hence, Two people are sitting between A and M from the right of M.

Seven people - A, B, C, K, L, M, and N

1- K is sitting second to the right of A. 

2- Only two people are sitting between K and L.

Case-1

Case-2

3- M sits third to the right of N. 

4- N is an immediate neighbor of K and only one person is sitting between L and N. 

5- Only two people are sitting between A and C. 

Case-1

Case-2

6- B is not an immediate neighbor of K. So case-1 gets eliminated.

So, the Final arrangement;

Hence, C is second to the left of B.