Ask a Question

Suppose `n ( >=3)` persons are sitting in a row. Two of them are selected at random. The probability that they are not together is (A) `1- 2/n` (B) `2

in Education by
Suppose n(≥3) persons are sitting in a row. Two of them are selected at random. The probability that they are not together is (A) 1- 2 n (B) 2 n-1 (C) 1- 1 n (D) nonoe of these A. 1- 1 n B. 1- 2 n C. 2 n+1 D. 2 n Select the correct answer from above options

1 Answer

0 votes
by
 
Best answer
Correct Answer - B The total number of ways of selecting 2 persons out of n persons sitting in a row is . n C 2 . . Number of ways in which two adjacent persons are selected from n persons sitting in a row =(n-1) Hence, required probability = . n C 2 − ( n − 1 ) . n C 2 = 1 − 2 n =

Related questions

0 votes
Q: In a party 23 persons take their seats at a round table. The odds against two particular persons sitting together are :
    In a party 23 persons take their seats at a round table. The odds against two particular persons sitting together ... . none of these Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Three different numbers are selected at random from the set `A = (1, 2, 3,...., 10).` The probability that the product of two of the numbers is equal
    Three different numbers are selected at random from the set A=(1,2,3,....,10). The probability that the product of ... 1 8 D. 39 40 Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Two numbers are selected at random from 1,2,3,....100 and are multiplied, then the probability correct to two places of decimals that the product thus
    Two numbers are selected at random from 1,2,3,....100 and are multiplied, then the probability correct to two places ... 67 75 D. 8 75 Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is `3//5`
    Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A ... 5 3 D. 1 5 1 Select the correct answer from above options...
asked Nov 16, 2021 in Education by JackTerrance
0 votes
Q: Two dice are numbered 1,2,3,4,5,6 and 1,1,2,2,3,3 respectively. They are thrown and the sum of the numbrees of them is noted. Find the probability of
    Two dice are numbered 1,2,3,4,5,6 and 1,1,2,2,3,3 respectively. They are thrown and the sum of the ... sum from 2 to 9 separately. Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: If 10 objects are distributed at random among 10 persons, then find the probability that at least one of them will not get anything.
    If 10 objects are distributed at random among 10 persons, then find the probability that at least one of them will ... . none of these Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Two numbers a and b are chosen at random from the set {1,2,3,..,3n}. The probability that `a^(3)+b^(3)` is divisible by 3, is
    Two numbers a and b are chosen at random from the set {1,2,3,..,3n}. The probability that a3+b3 is divisible by 3, ... ) C. 1 6 D. 1 3 Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Two numbers a and b are chosen at random from the set {1,2,3,..,5n}. The probability that `a^(4)-b^(4)` is divisible by 5, is
    Two numbers a and b are chosen at random from the set {1,2,3,..,5n}. The probability that a4-b4 is divisible ... -1) D. none of these Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: The probability that number selected at random from the numbers 1,2,3,…,15 is a multiple of 4, is
    The probability that number selected at random from the numbers 1,2,3,…,15 is a multiple of 4, is Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: Five persons entered the lift cabin on the ground floor of an 8 floor house. Suppose that each of them independently and with equal probability can le
    Five persons entered the lift cabin on the ground floor of an 8 floor house. Suppose that each of them independently and ... D. 5! 75 Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: From a group of 2 boy and 3 girls, two children are selected at random. Describe the events. A = both selected children are girls. B= the selected gro
    From a group of 2 boy and 3 girls, two children are selected at random. Describe the events. A = both ... (are) mutually exclusive? Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: From a group of 2 boy and 3 girls, two children are selected at random. Describe the events. A = both selected children are girls. B= the selected gro
    From a group of 2 boy and 3 girls, two children are selected at random. Describe the events. A = both ... (are) mutually exclusive? Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: Suppose an integer from 1 through 1000 is chosen at random, find the probability that the integer is a multiple of 2 or a multiple of 9.
    Suppose an integer from 1 through 1000 is chosen at random, find the probability that the integer is a multiple of ... multiple of 9. Select the correct answer from above options...
asked Nov 21, 2021 in Education by JackTerrance
0 votes
Q: Suppose an integer from 1 through 1000 is chosen at random, find the probability that the integer is a multiple of 2 or a multiple of 9.
    Suppose an integer from 1 through 1000 is chosen at random, find the probability that the integer is a multiple of ... multiple of 9. Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance

© Copyright 2018-2023 www.Blogmepost.com. All rights reserved. Developed by Blogmepost.

...