### Dictionary Rank of a Word | Permutations & Combinations

PERMUTATIONS & COMBINATIONS Rank of the word or Dictionary order of the English words like COMPUTER, COLLEGE, SUCCESS, SOCCER, RAIN, FATHER, etc. Dictionary Rank of a Word Method of finding the Rank (Dictionary Order) of the word  “R A I N” Given word: R A I N Total letters = 4 Letters in alphabetical order: A, I, N, R No. of words formed starting with A = 3! = 6 No. of words formed starting with I = 3! = 6 No. of words formed starting with N = 3! = 6 After N there is R which is required R ----- Required A ---- Required I ---- Required N ---- Required RAIN ----- 1 word   RANK OF THE WORD “R A I N” A….. = 3! = 6 I……. = 3! = 6 N….. = 3! = 6 R…A…I…N = 1 word 6 6 6 1 TOTAL 19 Rank of “R A I N” is 19 Method of finding the Rank (Dictionary Order) of the word  “F A T H E R” Given word is :  "F A T H E R" In alphabetical order: A, E, F, H, R, T Words beginni

### Case Study Based Questions Class XII

Topics to be Covered Here
Session 2020-21

1.) Discussion on Case Study Based Questions

• Brief Discussion on the Design of question paper.
• Importance of case study based questions.
• Possible Chapters for Case study based questions.
• Discussion on the case study based questions issued by C.B.S.E.
• Assignment on the selected chapters.

2.) Discussion on the Lab Manual.

• List of activities issued by C.B.S.E.
• Selected Lab Activities for this year.
• Method of writing the activities
• Distribution of Marks.
• Maintaining the Evaluation Record of activities.
Design of question paper
 Old Question Paper Style [36 questions] MM = 80 Section - A Section - B Section - C Section - D 20 x 1=20 marks 6 x 2 = 12 marks 6 x 4 = 24 marks 4 x 6 = 24 marks

 Present Question Paper Style [38 questions] MM = 80 Part – A[24 marks] Part – B[56 marks] Section - I Section - II Section - III Section - IV Section - V 16 x 1 = 16 marks 2 x 4 = 8 marks 10 x 2 = 20 marks 7 x 3 = 21 marks 3 x 5 = 15 marks

• The question paper consists of 38 questions and Maximum marks = 80
• The question paper contains two parts A and Part B
• Part A carries 24 marks and part B carries 56 Marks.
• Part A has Objective Type Questions and M.C.Q. and Part B has Descriptive type questions.

Part A
• Part A further divided into two sections Section - I and Section - II.
• Section-I comprises 16 very short answer type questions.
• Section - II contains two case studies (Q 17 and Q 18). Each case study comprises of 5 case based questions, from which student has to attempt any 4.

Part - B
• Part B further divided into three sections Section - III, Section - IV, Section - V
• Section-III contains 10 questions (from Q 19 to Q 28). Each question carry 2 marks. So this section is of 20 marks.
• Section-IV contains 7 questions (from Q 29 to Q 35). Each question carry 3 marks. So this section is of 21 marks
• Section - V contains 3 questions (from Q 36 to Q 38). Each question carry 5 marks. So this section is of 15 marks.

Importance of case study based questions

• 10 M.C.Q. with two choices.
• All questions are related to the case study only.
• Continuity in the questions.
• It increases the interest and creativity of the students.
• It also encourage the descriptive format of questions.

Requirements For the students

 Special Study Needed NO Practice Needed Yes Expected Difficulty Level Easy to Moderate

Possible Chapters for Case study based questions

There are 13 chapters in our N.C.E.R.T. book, but there are only 6 chapters from which Case Study Based Questions are possible.

• Matrices
• Determinants
• Application of Derivatives
• Differential equations
• Linear Programming
• Probability
But present conditions are slightly different. While selecting the chapters for case study, the following should be kept in mind.
• Reduced Syllabus.
• Restriction of Marks.
• Based on the Real World Scenario.
• Case study should be connected with 5 possible distinct M.C.Q.
Based on the above discussion we have the following conclusions

 Possible Chapters for case based study Possibility Chapter – 3: MatricesThis year certain topics are removed from C.B.S.E syllabus and according to the restriction of the distribution of marks, there is very less chances of case based questions from this topic this year. No Chapter – 4: DeterminantsThis year certain topics are removed from C.B.S.E syllabus and according to the restriction of the distribution of marks, there is very less chances of case based questions from this topic this year. No Chapter – 6: Application of derivatives YesSurely Chapter – 9: Differential EquationsBecause this year Formation of differential equations is removed from the C.B.S.E. syllabus No Chapter – 12: Linear ProgrammingBecause this year formulation of L.P.P. is removed from the C.B.S.E. syllabus. No Chapter – 13: Probability YesSurely

Chapters to prepare

 Chapter - 6 Application of Derivatives Chapter – 13 Probability Chapter – 3 and 4 Matrices and Determinants

Discussion on the case study based questions issued by C.B.S.E.

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Assignment on Case Based Questions

Chapter 6, 13,  3 & 4

Following points should be kept in mind while making the assignment

·  Reduced Syllabus.

·  Restriction of Marks.

·  Based on the Real World Scenario.

·  Case study should be connected with 5 possible distinct M.C.Q.

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Lab Manuals for class XII

Lab manual or lab activities are also new for classes 11 and 12. C.B.S.E. introduces lab manual in the curriculum from last session 2019-20.

Steps to be followed

• Throughout this session(2020-21)  any 10 activities out of 27 activities given in the C.B.S.E. lab manual shall be performed by the student.
• Record of the same may be kept by the student.
• An year end test on the activity may be conducted.
• After the test a viva-voce may be conducted.

Activities for  class XII

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The weightage are as under:

 Observations Marks The activities performed by the student throughout the year and record keeping 5 marks Assessment of the activity performed during the year end test 3 marks Viva-voce 2 marks Total 10 Marks

Method to maintain Record of Lab Activities

 Roll No. Students Name Record of written activities MM = 5 Marks obtained in written activities MM = 3 Viva-Voce MM = 2 Total MM = 10 1 2 3 4 5 6

Explanation of Some activities

Mathematics Lab Manual And Project Work for 11 and 12 Standard