• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Mathematics: Post your doubts here!

Messages
21
Reaction score
2
Points
13
how do you arrange the ppl who must be seperated from each other without using the method of all possible ways minus the ways that they sit together?
is there any other method?? help!!! i'm very weak in permutation and combination!!!
 
Messages
463
Reaction score
549
Points
103
how do you arrange the ppl who must be seperated from each other without using the method of all possible ways minus the ways that they sit together?
is there any other method?? help!!! i'm very weak in permutation and combination!!!
u get thee total arrangement with no restrictions, then if for example u need to separate 2 persons , then u get the number of arrangements when they r together and subtract it from the total.
 
Messages
90
Reaction score
24
Points
8
how do you arrange the ppl who must be seperated from each other without using the method of all possible ways minus the ways that they sit together?
is there any other method?? help!!! i'm very weak in permutation and combination!!!
for example there are 7 people and two must be seperated. so its like *p*p*p*p*p* where p refers to the 5 people who are and * are the possible places for those who dont want to sit together. therefore 5! *6P2
 
Messages
21
Reaction score
2
Points
13
for approximation questions, when do you +0.5 and when do you -0.5? im always confused with this. e.g using a suitable approximation, find the probability that more than 155 people wore a watch on their left wrist. what if they asked for less than 155? or at least? or at most?
 
Messages
2,619
Reaction score
293
Points
93
weelll for green gage one.....i was doing lykk this that....figured out when twoGS are 2gether....not exactly two...meany two and three both are there.....so got 8!/3!......and then wanted to subtract form when there were 3 Gs 2gether that is 7!/3!.......bt ms says 2* 7!/3!...plxx smbody tell me what i m overcounting @Khan_97171 plx anser thisss
 
Top