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Showing posts from October, 2020

### 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

### Math Assignment | Class XII | Ch-10 | Vector Algebra

Maths Assignment Class 12 Vector Algebra Chapter 10 Extra questions important for the examination. Maths assignment  on vector algebra for complete knowledge of the concept. Important steps that students need to do First of all students should learn and  revise all basic concepts and formulas of vector algebra. Revise Chapter 10 vector algebra  NCERT book of Mathematics. Revise all examples of chapter 10 of  NCERT book. Now start the Assignment. Assignment on Vector Algebra   Question 1  :$Show\;that\; the \; points\; with\; P. V.\; \vec{a}-2\vec{b}+3\vec{c},\; \;-2\vec{a}+3\vec{b}+2\vec{c}\; and$$-8\vec{a}+13\vec{b}\; are\; collinear\; vectors.$Hint: Let given vectors are the position vectors of point A, B and C. Find vector AB and AC. If one vector is the scalar multiple of the other then they are called parallel vectors. Also these are co-initial vectors so these vector are called collinear vectors.   Question 2 :  If A is a point (1, -2) a