MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
varsha jayant karandikar Grade:
        A and B stand in a ring with 10 others.if arrangement of 12 persons is at random then probability that there are exactly 3 persons between a and B is:


A)16/21
B)5/21
C)8/21
D)none
7 years ago

Answers : (1)

Pratham Ashish
17 Points
										

Dear Varsha ,


ans for the above ques is (D) none of these.


this is becuse

1st we have to select 3 out of 10 persons...then arrange them randomly....then arrange other 7 n at last arrange given 2.....................and divide them by total no of possible arrangements(for circular permutation it is(n-1)!)


ans= 10C3 * 3!*7!*2/11! = 2/11

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,000 off
USE CODE: MOB20
Get extra R 440 off
USE CODE: MOB20

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details