Two poles of height 2 meters and 3 meters, are 5 meters apart. The height of the point of intersection of the lines joining the top of each poles to the foot of the opposite pole is,
@gnehagarg : Yes , but you are missing the cases for other persons - total possibilities is 7C2*7C1*6*5*4*3*2
@sauravd2001 said:Two poles of height 2 meters and 3 meters, are 5 meters apart. The height of the point of intersection of the lines joining the top of each poles to the foot of the opposite pole is,
1.2m?
@sauravd2001 said:Two poles of height 2 meters and 3 meters, are 5 meters apart. The height of the point of intersection of the lines joining the top of each poles to the foot of the opposite pole is,
1.2
use basic formula
let height of first pole be a, and that of second pole be b
required height= ab/(a+b)
@hedonistajay said:x,y and z are positive integers such that x ,y and z are positive integers such that x
I think you should get some sleep :P
x=100, y=101, z=300
x+y+z=501
@sauravd2001 said:Two poles of height 2 meters and 3 meters, are 5 meters apart. The height of the point of intersection of the lines joining the top of each poles to the foot of the opposite pole is,
similar triangle case.
Answer=1.2
@hedonistajay said:
x,y and z are positive integers such that x ,y and z are positive integers such that
x
501.. ; x= 100 ; z=300 ; y = 101
The digits 1, 2, 3, ...., 9 are written in random order to form a nine-digit number. Find the probability that this number is divisible by 11.
@vijay_chandola said:I think you should get some sleep x=100, y=101, z=300x+y+z=501
lol ... ya i also think so ....
@chillfactor said:I think bold underlined word should be numbersabc, a can be 1, 6, 7, 8, 9b can be 0, 1, 6, 7, 8, 9c can be 0, 1, 6, 7, 8, 9So, 5*6*6 = 180 such numbersA man is known to speak truth 3 out of 4 times. He throws a die and reports that it is a six. Find the probability that it is actually a six.a) 3/4b) 3/8c) 1/2d) 2/3
3/4/(3/4+5/4)
3/8
@gautam22 said:sir ye kya hai beech ke distance ka koi matlab hi nahi hai?
ha wahi to... it is used to derive this formula.
1.)In each of the following questions a number series is given. After the series, below it, a number is given followed by (a), (b), (c), (d) and (e). You have to complete the series starting with the given number following the sequence for the given series. Then answer the questions given below it.
18 22 38 74
121 (a) (b) (c) (d) (e)
Which of the following numbers will come in place of c?
18 22 38 74
121 (a) (b) (c) (d) (e)
Which of the following numbers will come in place of c?
2.)If the lengths of the chords intercepted by the circle + 2gx + 2fy = 0 from the coordinates axes be 10 and 24 respectively, then the radius of the circle is?
3)Out of 3n consecutive integers, three are selected at random. Find the chance that their sum is divisible by 3.?
@sauravd2001 said:The digits 1, 2, 3, ...., 9 are written in random order to form a nine-digit number. Find the probability that this number is divisible by 11.
4!.5!/9!=1/126?
@gautam22 said:sir aap beech ka distance koi aur lo similar triangles lagao same nahi aayega....dekho ek baari
yaar mene derive kar rakha hai. u check it once again
@sauravd2001 said:The digits 1, 2, 3, ...., 9 are written in random order to form a nine-digit number. Find the probability that this number is divisible by 11.
even places arrangement =1,5,6,7,9=5!
Odd places arrangement= 2,3,4,8=4!
=> required probability=4!*5!/9!
@gautam22 said:sir aap beech ka distance koi aur lo similar triangles lagao same nahi aayega....dekho ek baari
Similar triangle would also give the same result. I did it using similar triangle.
@gnehagarg : Aap ki watch hamesha peeche rhti h kya bat 
Always solve 2 pages back questions 😛 :splat:
Always solve 2 pages back questions 😛 :splat:
@19rsb @vijay_chandola bhai 11/126 answere aa raha hai dekh lo bhai kisne ek 1 ka locha kiya hai tune ya book ne
@sauravd2001 said:@19rsb@vijay_chandolabhai 11/126 answere aa raha hai dekh lo bhai kisne ek 1 ka locha kiya hai tune ya book ne
let the sum of odd place digits=e
sum of even place digits=o
e+o=1+2+3...9=45
o-e can be 0, 11,22,33,44 etc for the divisibility of 11
e-o cannot be even as e+o is odd
=> o-e=-11, 11 or 33
for first case, o=28, e=17
for second case, o=17, e=28
for third case, e=6, o=39 (again not possible)
e=17 can be made in following ways:
1, 2, 6, 8
1, 2, 5, 9
1, 3, 4, 9
1, 3, 5, 8
1, 3, 6, 7
1, 4, 5, 7
2, 3, 5, 7
2, 3, 4, 8
2, 4, 5, 6
e=28 can be made in following ways:
5, 6, 8, 9
4, 7, 8, 9
So, a total number of 11*4!*5!/9!=11/126 ways
there has to be some short way 
2 taps A and B can fill a tank in 20 hrs and 30 hrs respectively.Both were opened together and just when the tank should have been full it was noticed that an emptying pipe was also open. The emptying pipe was then closed and it took 6 hrs more to fill the tank. In how much time emptying pipe empties the full tank.
Answer with solution
Answer with solution