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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

Vectors Algebra | Chapter 10 | Class XII

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Vectors Algebra | Chapter 10 |  Class XII   Note: Click here to open the Assignment on Vector Algebra Chapter 10 Class 12 Topics to be discussed here 1) Scalar and Vector Quantities 2) Different types of vectors 3) Unit Vector and Method of finding unit vector 4) Addition of vectors 5) Properties of vector addition 6) Components of a Vector 7) Method of finding Position Vector :   8)  Direction angles, Direction Cosines and Direction Ratios 9) Section Formula and Mid Point Formula 10) Scalar or Dot product of two vectors 11) Projection of a vector on a line  12) Vector Product (or cross product ) of two Vectors 13) Scalar Triple Product of Vectors 14) Properties of Scalar Triple Product of vectors 15) Volume of a parallelopiped using scalar Triple Product Complete Explanation of the above mentioned topics 1) Scalar and Vector Quantities All physical quantities are divided into two categories :- scalar  quantities and vector quantities. Scalar quantities :- Those physical quantities wh

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