JEE Mains · Maths · STD 12 - 10. vector algebra
Let the position vectors of three vertices of a triangle be \(4 \vec{p}+\vec{q}-3 \vec{r},-5 \vec{p}+\vec{q}+2 \vec{r}\) and \(2 \overrightarrow{\mathrm{p}}-\overrightarrow{\mathrm{q}}+2 \overrightarrow{\mathrm{r}}\). If the position vectors of the orthocenter and the circumcenter of the triangle are \(\frac{\vec{p}+\vec{q}+\vec{r}}{4}\) and \(\alpha \vec{p}+\beta \vec{q}+\gamma \vec{r}\) respectively, then \(\alpha+2 \beta+5 \gamma\) is equal to :
- A 3
- B 4
- C 1
- D 6
Answer & Solution
Correct Answer
(A) 3
Step-by-step Solution
Detailed explanation
We know that…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Maths
- \( \text { If } S(x)=(1+x)+2(1+x)^2+3(1+x)^3+\ldots . \) \( +60(1+x)^{60}, x \neq 0 \text {, and }(60)^2 S(60)=a(b)^b+b\) where \(a, b N\), then \((a+b)\) equal to ...............JEE Mains 2024 Hard
- If the shortest distance between the line joining the points \((1, 2, 3)\) and \((2,3,4)\), and the line \(\frac{x-1}{2}=\frac{y+1}{-1}=\frac{z-2}{0}\) is \(\alpha\), then \(28 \alpha^2\) is equal to \(........\).JEE Mains 2023 Hard
- If \(m\) and \(n\) respectively are the number of local maximum and local minimum points of the function \(f ( x )=\int_{0}^{ x ^{2}} \frac{ t ^{2}-5 t +4}{2+ e ^{ t }} dt\), then the ordered pair \(( m , n )\) is equal toJEE Mains 2022 Hard
- Let \(a, b\) be two real numbers such that \(a b < 0\). If the complex number \(\frac{1+ ai }{ b + i }\) is of unit modulus and \(a+i b\) lies on the circle \(|z-1|=|2 z|\), then a possible value of \(\frac{1+[ a ]}{4 b }\), where \([ t ]\) is greatest integer function, is :JEE Mains 2023 Hard
- Let the mean and variance of the frequency distribution
be \(6\) and \(6.8\) respectively. If \(x_{3}\) is changed from \(8\) to \(7 ,\) then the mean for the new data will be:\(\mathrm{x}\) \(\mathrm{x}_{1}=2\) \(\mathrm{x}_{2}=6\) \(\mathrm{x}_{3}=8\) \(\mathrm{x}_{4}=9\) \(\mathrm{f}\) \(4\) \(4\) \(\alpha\) \(\beta\) JEE Mains 2021 Easy - Let \(f: \mathrm{R} \rightarrow \mathrm{R}\) be a function given by \(f(x)= \begin{cases}\frac{1-\cos 2 x}{x^2} & , x<0 \\ \alpha & , x=0, \text { where } \alpha, \beta \in R \text {. If } \\ \frac{\beta \sqrt{1-\cos x}}{x} & , x>0\end{cases}\) \(f\) is continuous at \(\mathrm{x}=0\), then \(\alpha^2+\beta^2\) is equal to :JEE Mains 2024 Medium
More PYQs from JEE Mains
- If \(A\) and \(B\) are two non-zero \(n \times n\) matrics such that \(A ^2+ B = A ^2 B\), thenJEE Mains 2023 Hard
- Let \(\vec{a}=\hat{i}-3 \hat{j}+7 \hat{k}, \vec{b}=2 \hat{i}-\hat{j}+\hat{k}\) and \(\vec{c}\) be a vector such that \((\vec{a}+2 \vec{b}) \times \vec{c}=3(\vec{c} \times \vec{a})\). If \(\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{c}}=130\), then \(\overrightarrow{\mathrm{b}} \cdot \overrightarrow{\mathrm{c}}\) is equal to ....................JEE Mains 2024 Hard
- Consider the lines \(L _1\) and \(L _2\) given by \(L_1: \frac{ x -1}{2}=\frac{ y -3}{1}=\frac{ z -2}{2}\) \(L _2: \frac{ x -2}{1}=\frac{ y -2}{2}=\frac{ z -3}{3}\) A line \(L _3\) having direction ratios \(1,-1,-2\), intersects \(L _1\) and \(L _2\) at the points \(P\) and \(Q\) respectively. Then the length of line segment \(PQ\) isJEE Mains 2023 Medium
- If the number of integral terms in the expansion of \(\left(3^{\frac{1}{2}}+5^{\frac{1}{8}}\right)^{\text {n }}\) is exactly \(33,\) then the least value of \(n\) isJEE Mains 2020 Medium
- Let \(a_{n}\) be the \(n^{\text {th }}\) term of a G.P. of positive terms. If \(\sum\limits_{n=1}^{100} a_{2 n+1}=200\) and \(\sum\limits_{n=1}^{100} a_{2 n}=100,\) then \(\sum\limits_{n=1}^{200} a_{n}\) is equal toJEE Mains 2020 Hard
- If a variable line, \(3x + 4y -\lambda = 0\) is such that the two circles \(x^2 + y^2 -2x -2y + 1 = 0\) and \(x^2 + y^2 -18x -2y + 78 = 0\) are on its opposite sides, then the set of all values of \(\lambda \) is the intervalJEE Mains 2019 Hard