Quant by Arun Sharma

@davidvilla7 said: Please answer: Two poles of height a and b units are c units apart from each other. The height h of the point of intersection of lines joining the top of each pole to the foot of opposite pole is_____ of the height of two poles. 1. AM 2. GM 3. HM/2
It's HM/2

Basically,the relation b/w the height of intersection of crossed lines and the heoght of poles would be given by 1/c = 1/a + 1/b

=>c = ab/(a+b) = HM/2

Q. What is the tol number of factors of 16!?

Q. Find the sum of first 125 terms of the sequence 1,2,3,2,1,4,3,2,1,5,4,3,2,1,.....?

Q. Rem of 123412341234....upto 400 digits divided by 909?

Q. Sum of digits of the decimal form of the product (2^999)*(5^1001)?

Q. Find the remainder when 971((30^99)+(61^100))*(1148^56) is divided by 31?

@oldkool said: Q. What is the tol number of factors of 16!?

16! = (2^15).(3^6).(5^3).(7^2).(11^1).(13^1)
So, no. of factors = 16*7*4*3*2*2=5376

@oldkool said: Q. Find the sum of first 125 terms of the sequence 1,2,3,2,1,4,3,2,1,5,4,3,2,1,.....?


is it 779

779??????ans??
Find the remainder when 971((30^99)+(61^100))*(1148^56) is divided by 31
any approach???????????????//

why u did in this que as : summation of n terms: [3*n*(n+1)]/2+2n
can't it be done like:
a+(n-1)d>=670???
plz expain

@mani0303 said: 1)nth term in the series is 3n + 2Summation of n terms would be [3*n*(n+1)]/2 + 2n >= 670Check for easier terms like 10,15,or 20At n = 20,[3*n*(n+1)]/2 + 2n = 6702)For the 2nd,he gets 3 more than 1st,for 3rd week,he gets 6 more than 1stso,for the 20th week,he gets 19*3(=57) more than 1stSo,the amount earned on 20th week is 60 + 3*19 = 117

no it's 2/9
(que in post 5463)

@mani0303 said: I think a = 1/2 ll do that ll share the approach if it's right

@[550618:mani0303]:I used to solve speed and time ques by long equation method, which was a lengthy process. So now i am trying to learn the ratio proportion method. Can u plz share some basics tips and tricks so that i may understand. Thanks.

@[563226:mbajamesbond]


I have used bottom-up approach; i.e. start from the options
1. from the Q; final total score should be 756 runs
2. from the options provided - lookout for option which perfectly divides this 756.

Ans. 28

There are N different books & P copies of each in a library.Find the number of ways in which one or more than one book can be selected??

Q 30 . According to a plan, a team of woodcutters decided to harvest 216 cubic meter of wheat in several days. In the first three days , the tam fulfilled the daily assignment, and then it harvested 8 cubic meter of what over and above the plan everyday . Therefore, a day before the planned date, they had already harvested 232 cubic meter of wheat . How many cubic meter of wheat day did the tam have to cut according to plan?

  1. 12
  2. 13
  3. 24
  4. 25
  5. 26

Guys i need help in some question from Averages, But they are so big and dependent that I can't write it over here. I'm putting down the question can someone give me the detailed solution for them?

here are the question no from LOD 2 section.
Q35

here are the question no from LOD 3 section.

Q22
Q27
Q37
Q39
Q45 - Q47

Q 3 . In 1919, W.Rhodes, The yorkshire cricketer , scored 891 run for his country at an average of 34.27, in 1920 he scored 949 runs at an average of 28.75, in 1921, 1329 runs at an average of 42.87 and 1922, 1101 runs at an average of 36.70. What was his county batting average for the four year?

  1. 36.23
  2. 37.81
  3. 35.88
  4. 28.72
  5. None of these

Q 16 . A batsman make a score of 270 runs in 87th inning and thus increases his average by a certain number of runs that is a whole no. Find the possible value of the new average.

  1. 98
  2. 184
  1. 12
  1. All of these
@mickym said: There are N different books & P copies of each in a library.Find the number of ways in which one or more than one book can be selected??
(P+1)^N - 1 ?

@[592846:YouMadFellow] plz explain?

@mickym said: @YouMadFellow plz explain?
There are N different books ... B1 B2.. Bn
and there are P books of each kind.. i.e. p books of B1, p books of B2 etc...

Now, you want to select one or more books from this whole library, so you can select B1 in (P+1) ways i.e take 0 B1 books or take 1 B1 books or take 2 B1 books or... or take P .. B1 books

similarly all other books can also be taken in (P+1) ways

So, (P+1)^N

But one of this would be the case when you select 0 B1 books, 0 B2 books, ... 0 Bn books , and that has to be subtracted

So, (P+1)^N - 1

@[592846:YouMadFellow] correct & thanks a lot

A security agency assigns a two-digit code with distinct digits to each of its members using the digits 0, 1, 2,....., 9 such that first digit of code is not zero . However the code printed on a badge potentially create confusion when read upside down.For example the code 18 may appear as 81. how much codes are there for which no such confusion can arise ?


@ajayarora116 said: A security agency assigns a two-digit code with distinct digits to each of its members using the digits 0, 1, 2,....., 9 such that first digit of code is not zero . However the code printed on a badge potentially create confusion when read upside down.For example the code 18 may appear as 81. how much codes are there for which no such confusion can arise ?
confusion ll occur in 6, 8 , 9
so 9 numbers are made from dem..
total 2 digit numbers = 90
90-9 = 81
A person buys a piece of property for RS 100000 down payment and ten deferred semi-annual payments of RS 8000 each starting three years from now. What is the present value of the investment if the rate of interest is 12% compounded semi-annually?