Subject: Maths, asked on 14/4/18

## Please give an.easy solution ILLUSTRATION 1 Let ABC be a triangle having its centroid at G. If S is any point in the plane of the triangle, then $S\stackrel{\to }{A}+S\stackrel{\to }{B}+S\stackrel{\to }{C}=$ (a) $S\stackrel{\to }{G}$ (b) 2 $S\stackrel{\to }{G}$ (c) $3S\stackrel{\to }{G}$ (d) $\stackrel{\to }{0}$ Ans. (c)

Subject: Maths, asked on 2/4/18

## Solve this: ​Q25. Let a, b and c be three non-zero vectors such that no two of them are collinear and (a × b) × c = $\frac{1}{3}$|b|| c| a. If $\mathrm{\theta }$ is the angle between vectors b and c, then a value of sin $\mathrm{\theta }$  is       (a) $\frac{2\sqrt{2}}{3}$                                 (b) $\frac{-\sqrt{2}}{3}$          (c) $\frac{2}{3}$                                        (d) $\frac{-2\sqrt{3}}{3}$

Subject: Maths, asked on 1/4/18

## let a= i+4j+2k , b= 3i-2j+7k and c=2i-j+4K which of the following is representing a vector p which is perpendicular to both a and b and also whose scalar product with c would be p.c=18

Subject: Maths, asked on 30/3/18

## Please solve example 20 Q. EXAMPLE 20. If    are three non - zero vectors which are pairwise non-collinear. If   is collinear  is :                                                                                                                           [ AIEEE 2011 ]

Subject: Maths, asked on 29/3/18
Subject: Maths, asked on 26/3/18

## Solve this: Q. Which one of the following vectors of magnitude $\sqrt{51}$ makes equal angles with three vectors                     ?

Subject: Maths, asked on 26/3/18
Subject: Maths, asked on 26/3/18

## 116.  1.  1                               2.  2                     3.   3                   4.     4

Subject: Maths, asked on 26/3/18

## Q . 21 solution ​

Subject: Maths, asked on 26/3/18

## The cosine of the angle between vectors p and q such that 2p+q=i+j , p+2q=i-j is

Subject: Maths, asked on 23/3/18

## Solve this : (i) If the sum of two unit vectors is a unit vector then show that the magnitude of their difference is $\sqrt{3}.$

Subject: Maths, asked on 21/3/18

## Question 5

Subject: Maths, asked on 21/3/18

## If a,b,c are unit vectors prove that |a-b|^2 + |b-c|^2 + |c-a|^2 ?9

Subject: Maths, asked on 20/3/18

## Given: a→ × b→ = a→ × c→, a→ ≠ 0, b→ ≠ c→To prove: b→ = c→ + ta→ for some scalar 't'Given: a→ × b→ = a→ × c→, a→ ≠ 0, b→ ≠ c→To prove: b→ = c→ + ta→ for some scalar 't'

Subject: Maths, asked on 20/3/18
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