A person while dialing a telephone number, forgets the last three digits of the number but remem...

Channel:
Subscribers:
447,000
Published on ● Video Link: https://www.youtube.com/watch?v=zphhU9N8tXE



Duration: 3:43
27 views
1


A person while dialing a telephone number, forgets the last three digits of the number but remembers that exactly two of them are same. He dials the number randomly. The probability that he dialed the correct number, is equal to.
(A) \( \frac{1}{135} \)
(B) \( \frac{1}{27} \)
(C) \( \frac{1}{54} \)
(D) \( \frac{1}{270} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live




Other Videos By PW Solutions


2022-12-01CAM-plants avoid photorespiration by: (a) performing Calvin cycle at night. \( \mathrm{P} \) (b)...
2022-12-01Match the following columns. Column I Column II A. Oestrus cycle 1. Spirogyra B. Conjugation 2. ...
2022-12-01Match the following columns. \begin{tabular}{lllllll} \multicolumn{9}{c}{ Column I } & Column II...
2022-12-01Match the following columns.
2022-12-01Match the following columns.
2022-12-01The sum of two natural numbers \( n_{1} \) and \( n_{2} \) is known to be equal to 100. The prob...
2022-12-01What would happen if lysosomes get ruptured inside the cells in which they are present? P W (a) ...
2022-12-01Identify the components labelled as \( 1,2,3,4 \) (i) Cristae of mitochondria and 5 in the diagr...
2022-12-01If the papers of 4 students can be checked by any one of the 7 teachers, then the probability th...
2022-12-01Improved varieties of wheat suitable for India climates have been developed by: (A) hybridisatio...
2022-12-01A person while dialing a telephone number, forgets the last three digits of the number but remem...
2022-12-01A small disc and a thin uniform rod of length 1 , whose mass is \( \eta \) times greater than th...
2022-12-01A real estate man has eight master keys to open several new homes. Only one master key will open...
2022-12-01In a bag there are 15 red and 5 white balls. Two balls are drawn in succession, without replacem...
2022-12-01Three children are selected at random from a group of 6 boys and 4 girls. It is known that in th...
2022-12-01Two fair dice are rolled simultaneously. One of the dice shows four. The probability of other di...
2022-12-01Read the \( \quad \) statements about Paramecium. I. Paramecium has Kappa, Lambda, Mu and Pi par...
2022-12-01In a certain city \( 40 \% \) of the people have brown hair, \( 25 \% \) have brown eyes and \( ...
2022-12-01A five digit number (having all different digits) is formed using the digits \( 1,2,3,4,5 \), \(...
2022-12-01A bag contains 4 red, 5 white and 6 black balls. Three balls are selected from this bag simultan...
2022-12-01Three numbers are chosen at random with out replacement from the set of integers \( \{1,2,3, \ld...