With respect to a particular question on a multiple choice test (having 4 alternatives with only....

Channel:
PW Solutions
Subscribers:
480,000
Published on ● Video Link: https://www.youtube.com/watch?v=LPEKDjhSk6I


Duration: 5:22
2 views
0

With respect to a particular question on a multiple choice test (having 4 alternatives with only 1 correct) a student knows the answer and therefore can eliminate 3 of the 4 choices from consideration with probability \(2 / 3\), can eliminate 2 of the 4 choices from consideration with probability \(1 / 6\), can eliminate 1 choice from consideration with probability \(1 / 9\), and can eliminate none with probability \(1 / 18\). If the student knows the answer, he answers correctly, otherwise he guesses from among the choices not eliminated.If the answer given by the student was found correct, then the probability that he knew the answer is \(a / b\) where \(a\) and \(b\) are relatively prime. Find the value of \((a+b)\). 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2024-05-11The moment of inertia of a body depends o....
2024-05-11A horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions ....
2024-05-11A hollow sphere of mass \(1 \mathrm{~kg}\) and radius \(10 \mathrm{~cm}\) is free to rotate abou....
2024-05-11A force \(\vec{F}=(2 \hat{i}+3 \hat{j}-5 \hat{k}) \mathrm{N}\) acts at a point \(\vec{r}_{1}=(2 ....
2024-05-11A quarter disc of radius \(R\) and mass \(m\) is rotating about the axis \(O O^{\prime}\) (perpe....
2024-05-11Let \(N\) denotes the sum of the numbers obtained when two dice are rolled. If the probability t....
2024-05-11If two discs of moment of inertia \(I_{1}\) and \(I_{2}\) rotating about collinear axis passing ....
2024-05-11A swimmer while jumping into river from a height easily form a loop in air if....
2024-05-11Three rods each of mass \(m\) and length \(L\) are joined to form an equilateral triangle as sho....
2024-05-11Two equal and opposite forces are applied tangentially to a uniform disc of mass M and radius R ....
2024-05-11With respect to a particular question on a multiple choice test (having 4 alternatives with only....
2024-05-11Die \(A\) has four red faces and two white faces, dieB has two red and four white faces. A ....
2024-05-11A circular disc is to be made by using iron and aluminium so that it possesses maximum moment of....
2024-05-11A hotel packed breakfast for each of the three guests. Each breakfast should have consisted of t....
2024-05-11A jar contains \(2 n\) thoroughly mixed balls, \(n\) white and \(n\) black balls. \(n\) persons ....
2024-05-11A pair of students is selected at random from a probability class. The probability that the pair....
2024-05-11Integers \(a, b, c\) and \(d\) not necessarily distinct, are chosen independently and at random ....
2024-05-11Let 6p-15x2+(p-5)p2-4p+3x+p-23=0where \(\{y\}\) and \([y]\) denote fractional part function....
2024-05-11Consider three vectors \(\vec{v}_1=\alpha \hat{i}+\beta \hat{j}+\gamma \hat{k}, \quad \vec{v}_2=....
2024-05-11A game is played with a special fair cubic die which has one red side, two blue sides, and three....
2024-05-11Consider 4 functions f(x)=x2sin1x,x≠00, x=0,g(x)=x2+1|x+1| h(x)=sgnx2-4x+5&nbs....