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
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 880 off
USE CODE: SSP40

				   

let A= set of 3x3 determinat having entries +1 or -1, if a determinat A1 is chosen randomly from the set of A,then the probability that the product of the elements of any row or any column of A1 is -1 is _

4 years ago

Share

Answers : (2)

										

I am not sure, but here is my best guess.


 


 


Sample Space = 2^9


 


(There are 9 positions, each position has two possiblities (-1 or +1) )


 


Favourable Outcomes :


 


Number of -1 in each row or coloumn should be odd.


So we get two cases here.


(i) No. of -1 in each row and coloumn is 3


(ii) No. of -1 in each row and coloumn is 1


 


Case 1:


 


This case can occur only when all the elements in the matrix is -1.


 


No. of favourable cases = 1


 


Case 2:


 


Consider the matrix row wise.


In the first row, you can put the -1 in any of the 3 places.


In the second row, you can put the -1 in two places (no below the previous one)


In the third row, you can put the -1 in only one place (remaining one, not below the other two).


 


So you get 3*2*1 = 6 possibilities in this case.


 


Total no. of favourable outcome = 6+1 = 7


 


So required probability is 7/29 ..

4 years ago
										

Okay I missed a case.


 


All digits in a single row are -1. Rest of the elements are 1.


So we get 3 more cases.


 


So Probability = 10/2^9

4 years ago

Post Your Answer

Please can someone explain by venn diagrams how independent and mutually exclusive events are different.
 
 
Dear Student, Mutually Exclusive events will be shown by non intersecting area in the Veen diagrams. Whereas, For independent events they may or may not intersect each other but they follow...
  img
Vijay Mukati 10 months ago
find the coefficient of x^4 in the expansion of (1+x-2x^2)^7
 
 
IN THE EXPANSION (1+X-2X 2 ) 7 THE COEFICIENT OF X 4 IS 4*7C 2 +7C 3 *6+7C 4 IN THIS EXPANSION YOU HAVE TO THINK CAREFULLY
 
RAMCHANDRARAO 4 months ago
 
 
jagdish singh singh 4 months ago
 
 
jagdish singh singh 4 months ago
What is quadratic formula say Very fastly please very important
 
 
Dear Subhang reddy, Quadratic formula is the determine of variables in quadratic expression which is second degree that is
 
SAI SARDAR 5 months ago
 
Dear Subhang Reddy it is the quadratic formulae r all the bet for your bright future.................................................
 
Prabhakar ch 5 months ago
what is the hardy number of ramanujans...........?????????????
 
 
mohan “It is the smallest number that can be written as the sum of two cubes in two different ways!” And 1,729 is indeed the smallest such number. And because of this incident, it is now...
 
Y MANJUNADH 4 months ago
 
"Once, in the taxi from London, Hardy noticed its number, 1729 . He must have thought about it a little because he entered the room where Ramanujan lay in bed and, with scarcely a hello,...
 
T.kumar 4 months ago
 
hai mohan 1729 is the natural number following 1728 and preceding 1730. 1729 is the Hardy–Ramanujan number after a famous anecdote of the British mathematician G. H. Hardy regarding a visit ...
 
manichandra 4 months ago
If sinasinb-cosacosb +1=0 prove that 1+cota tanb=0
 
 
Hint: use sina*sinb= ½ * (cos(a-b) – cos(a+b)), and cosa*cosb = ½ * (cos(a-b) + cos(a+b)), simplify and you will get, a + b = 2n*pi, just put in second equation
 
Akshay 10 months ago
 
sinasinb-cosacosb=-1 so,cos(a+b)=-1 so,a+b=180 or a=180-b 1+tanbcota 1+tanb/tana (tana+tanb)/tana (tan(180-b)+tanb)/tana (-tanb+tanb)/tana =0 Hence proved.
 
Akhil Chinnu 8 months ago
 
thanks bro
 
Mohammed Tameem Mohiuddin 8 months ago
a car makes at a displacement of 100m toward east and then 200m towards north.find tne magnitude and direction of the resultant?
 
 
resultant displacement is (100 2 +200 2 ) 1/2 =(10000+40000) 1/2 =50000 1/2 =100(5) ½ the direction is North east
 
Ankit Jaiswal 3 months ago
 
R = [(200) 2 + (100) 2 ] 1/2 in the dir n of N-E
 
Shivam one year ago
 
sorry dirn is 100i+200j/[50000] 1/2
 
Shivam one year ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 6,000 off
USE CODE: SSP40

Get extra R 880 off
USE CODE: SSP40

More Questions On Algebra

Ask Experts

Have any Question? Ask Experts

Post Question

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