• 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
169
Reaction score
117
Points
38
View attachment 38756

180 + ACD + ACB = bearing of B from C

as we know BAC = ACD
so 180 + ACD + ACB = 180 + BAC + ACB


150 + ACB + BAC = 180
ACB + BAC = 30 = ACD + ACB

180 + ACD + ACB = 180 + 30 = 210


as we know BAC = ACD
so 180 + ACD + ACB = 180 + BAC + ACB the logic behind this ?
the bearing is 180 + the exterior and interior angles...i understand this part

but how is 180 also added to two interior angles of a trinngle
if we consider the sum of interior angles of trianle which sum to 180 then .. 180-150=30 which includes two angles that are left right ?
 
Messages
3,401
Reaction score
9,793
Points
523
as we know BAC = ACD
so 180 + ACD + ACB = 180 + BAC + ACB the logic behind this ?
the bearing is 180 + the exterior and interior angles...i understand this part

but how is 180 also added to two interior angles of a trinngle
if we consider the sum of interior angles of trianle which sum to 180 then .. 180-150=30 which includes two angles that are left right ?
untitled.JPG

does this help or should i explain?
 
Messages
1,665
Reaction score
2,400
Points
273
25x is in the question....look at it carefully agn......its written in the denominator tht x3 -10x2+25x........if this is not the corecct question thn give the coreect one....cuz the one u posted has 25x.....recheck the question
but 25 x is not there in the equation ...its only 25.. so how is x common to all terms of equation
 
Messages
169
Reaction score
117
Points
38
upload_2014-4-11_16-56-13.pngA(a) the probablity that one is faulty is 1/20 given so p is 1/20 and the probability that its not is the 19 parts left of 20 so 19/20 is q
(bi) probability that two chosen are faulty is going to be 1/20 * 1/20 that is 1/400
(bii) exactly one is faulty could be either the first one or the second so = 1/20 * 19/20 + 19/20* 1/20 = 38/400 = 19/200upload_2014-4-11_17-1-23.png(c) now the third pick should be also one of the faulty after the probability that the two first picked have one faulty too. this is part bii * 1/20 (p. of third faulty)
(d) the probability that both faulty is 1/20 * 1/20 already calculated =1/400 and the third being faulty is 19/4000 that is part c add both and you'll get the answer.
(e) this is the simplest. you already got part d the probability that the stock gets rejected. multiply it with 1000 to get the numbers of faulty ones! :) i hope you understood.
though i dint understanad why the total amount of calculators remain equal in all cases at the denominator such that these events are mutually exclusive !
 
Messages
1,665
Reaction score
2,400
Points
273
View attachment 38825A(a) the probablity that one is faulty is 1/20 given so p is 1/20 and the probability that its not is the 19 parts left of 20 so 19/20 is q
(bi) probability that two chosen are faulty is going to be 1/20 * 1/20 that is 1/400
(bii) exactly one is faulty could be either the first one or the second so = 1/20 * 19/20 + 19/20* 1/20 = 38/400 = 19/200View attachment 38826(c) now the third pick should be also one of the faulty after the probability that the two first picked have one faulty too. this is part bii * 1/20 (p. of third faulty)
(d) the probability that both faulty is 1/20 * 1/20 already calculated =1/400 and the third being faulty is 19/4000 that is part c add both and you'll get the answer.
(e) this is the simplest. you already got part d the probability that the stock gets rejected. multiply it with 1000 to get the numbers of faulty ones! :) i hope you understood.
though i dint understanad why the total amount of calculators remain equal in all cases at the denominator such that these events are mutually exclusive !
this is with replacment.......and in the question it is written EACH time a faulty calculator is chosed the probability is 1/20....there u go
 
Top