1. 

The data is statements 1, 2 and 3 together are necessary to answer the question.
2. 

The data in statement 1, 2 and 3 together are necessary to answer the question.
3. 

The date in statement 1 and 3 are sufficient to answer the question, while the data in statement 2 are not required to answer the question.
4. 

From statement 1,
L is the husband of D. As L has three children, D also has three children.
From statement 2,
N, S, and P are siblings and are the children of L and of D also. Thus D is the mother of S.
5. 

From statement 1,
N > M > K
From statement 2,
L > N
From both the statements,
L > N > M > K
but height of j is not clear. thus second tallest friend cannot be determined. Hence, data neither in statement 1 nor in statement 2 are sufficient to answer the question.
6. 

From statement 1,
Number of students in the class = 21 or 22 or 23 or 24 or 25 or 26
From statement 2,
Number of students in class = 25 or 26 or 27 or 28 or 29 or 30
Since, number of students can be divided into groups of 5 students, therefore number of students must be a multiple of 5.
so, number of students in the class = 25 or 30
Combing statement 1 and 2.
number of students in the class = 25
Hence, the data in both the statements 1 and 2 together are necessary to answer the question.
7. 

From statement 1,
R A _ G E
Clearly, the left place or empty place filled by N.
From statement 2,
_ A N G _
_G N A _
Clearly, N is at third place.
Hence, the data either in statement 1 alone or in statement 2 alone are sufficient to answer the question.
8. 

The data in statement 1 alone or in statement 2 alone are sufficient to answer the question.
9. 

The data in both the statement 1 and 2 together are necessary to answer the question.
10. 

The data given in both the statement 1 and 2 together are not necessary to answer the question.
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