20. which of the following statement(s) is/are true ? (a) (123 .n)' = (n, n - 1..2 1) ()both (a) and (6) (1 2 3..n)"* (n, n - 1.2 1) (b) (d) neither (a) nor (b)

 Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.

 Eduncle served as my guiding light. It has a responsive doubt solving team which solves & provides good solutions for your queries within 24 hours. Eduncle Mentorship Services guides you step by step regarding your syllabus, books to be used to study a subject, weightage, important stuff, etc.

 The General Aptitude part of Eduncle study materials were very good and helpful. Chapters of the Earth Science were also very satisfactory.

 The study material of Eduncle helps me a lot. The unit wise questions and test series were helpful. It helped me to clear my doubts. When I could not understand a topic, the faculty support too was good. Thanks Eduncle.

 I recommend Eduncle study material & services are best to crack UGC-NET exam because the material is developed by subject experts. Eduncle material consists a good no. of ques with online test series & mock test papers.

 I am truly Statisfied with study material of Eduncle.com for English their practise test paper was really awsome because it helped me to crack GSET before NET. Thanks Team of eduncle.