Search found 62 matches
Easy way is to go by answers
5C2 * XC2 = 150
If X = 6 , it solves the above equation
so, answer is 6
- by kishore
Sat Jun 21, 2008 6:58 pm- Forum: Problem Solving
- Topic: Combinatorics
- Replies: 4
- Views: 1554
Ans) 15
2^x - 2^x-2 = 3 * (2 ^ 13)
2^x - 2^x/2 ^2 = 3 * (2 ^ 13)
take 2 ^x as common factor
2^x(1-1/4) = 3 * (2 ^ 13)
2^x * 3/4 = 3 * (2 ^ 13)
3 * 2^x/4 = 3 * (2 ^ 13)
3 * 2^x/2^2 = = 3 * (2 ^ 13)
3 * 2^x-2 = 3 * (2 ^ 13)
x-2 = 13
x = 15
- by kishore
Sat Jun 21, 2008 6:54 pm- Forum: Problem Solving
- Topic: Quick way to figure out exponents?
- Replies: 3
- Views: 2573
- by kishore
Sat Jun 21, 2008 6:31 pm- Forum: Problem Solving
- Topic: Probability Question
- Replies: 3
- Views: 1341
first car sold at = 125/100 * 20,000 = 25000 $
Second car sold at = 80/100 * 20,000 = 16000 $
Selling price of both the cars = 41000 $
Cost Price of both the cars = 40000 $
Since , selling price is less than cost price, its a loss
loss= 41000 - 40000 = 1000 $
- by kishore
Sat Jun 21, 2008 6:28 pm- Forum: Problem Solving
- Topic: Basic Artihmetic
- Replies: 2
- Views: 1295
Ans) n = 21
5 ^21 * 4 ^ 11 = 2 * 10 ^ n
5 ^ 21 * (2^2)^11 = 2 * 10 ^ n
5 ^ 21 * 2^22 = 2 * 10 ^ n
5 ^ 21 * 2^11 * 2 = 2 * 10 ^ n
5 ^ 21 * 2^11 can be written as 10 ^ 21
2 * 10 ^ 21 = 2 * 10 ^ n
=> n = 21
- by kishore
Sat Jun 21, 2008 6:22 pm- Forum: Problem Solving
- Topic: Exponents
- Replies: 4
- Views: 1667
- by kishore
Sat Jun 21, 2008 3:11 pm- Forum: Problem Solving
- Topic: pls help
- Replies: 7
- Views: 1677
Hey atlantic,
-1-1/(-1) = 2 ????
Please review it properly...it is 0
Let's derive
1/-1 = -1
= > -1 - 1/(-1) = -1-(1/-1) = -1-(-1) = -1+1 = 0
- by kishore
Sat Jun 21, 2008 2:55 pm- Forum: Problem Solving
- Topic: pls help
- Replies: 7
- Views: 1677
Since radius from center O = 1
diameter of the circle = 2
Base = AC = diamter = 2
Height = BC = 1
Area of Traingle = 1/2 * Base * Height
= 1/2 * 2 * 1 = 1
= 1
- by kishore
Sat Jun 21, 2008 2:40 pm- Forum: Problem Solving
- Topic: GMAtprep question
- Replies: 6
- Views: 2355
Question 1:
find lenghts of each sides of traingles.
QP = 5
PR = 5
QR = sqrt(50)
since (QR)^2 = (QP) ^ 2 + (PR) ^ 2
Its an right angle triangle
A = 1/2 * B * H = 1/2* QP * PR = 1/2* 5 * 5 = 25/2 = 12.5
Question 2:
Ans) E
- by kishore
Sat Jun 21, 2008 2:34 pm- Forum: Problem Solving
- Topic: Area of triangle question
- Replies: 1
- Views: 1209
If 2^(-2x) + 2^(-x)-6=0, x-1/x=?
2^(-2x) + 2^(-x)-6=0
2^(-2x) + 2^(-x) = 6
If x = -1
2^(-2 *-1)+ 2^(-(-1)) = 6
Therefore x = -1
x-1/x = -1 - 1/(-1) = -1+1 = 0
- by kishore
Sat Jun 21, 2008 2:26 pm- Forum: Problem Solving
- Topic: pls help
- Replies: 7
- Views: 1677
From the question:
E -- English
H -- History
M -- Maths
E = 2 * H
=> H = E/2
E = 3 * M
=> M = E/3
There for ratio of History to Math Majors is
H:M
= E/2:E/3 = 1/2:1/3 = 3:2
- by kishore
Sat Jun 21, 2008 2:18 pm- Forum: Problem Solving
- Topic: GMAT prep PS ratio question
- Replies: 1
- Views: 1371
Ans) 0.30 $
1 kg of main ingredeint = 500 $
main ingredient in 1 capsule = 600 milligrams
1 kg = 10 ^ 6 milligrams
1kg = 10 ^ 6 milligrams costs 500 $
There fore, how much does 600 milligrams cost?
10 ^ 6 * X = 600 * 500
=> X = .30
- by kishore
Sat Jun 21, 2008 2:13 pm- Forum: Problem Solving
- Topic: GMATprep problem
- Replies: 1
- Views: 1248
Both farmers and hours areinversely proportional => More farmers less number of hours do the job work = No. of farmers * hours W1 = 5 * 20 ( 5 farmers and 20 hours) W2 = 8 * H ( 8 farmer and H hours) Since , work is same in both cases W1 = W2 5 * 20 = 8 * H => H = 25/2 = 12.5 hrs
- by kishore
Sat Jun 21, 2008 11:19 am- Forum: Problem Solving
- Topic: farmers
- Replies: 2
- Views: 1493
A fair coin is flipped 3 times, what is the probability it will land heads up exactly twice? Ans) C .375 heads show up exactly twice when a coin is flipped 3 times is HHT HTH THH There fore, you can expect exactly 2 heads show up = 3 Total out comes = 8 HHH HHT HTH THH TTH THT HTT TTT Probability = ...
- by kishore
Fri Jun 20, 2008 8:32 pm- Forum: Problem Solving
- Topic: help on probability
- Replies: 3
- Views: 1618
- by kishore
Fri Jun 20, 2008 10:01 am- Forum: Problem Solving
- Topic: plz help me solve this sum
- Replies: 7
- Views: 5702