Friday, November 2, 2007

1).Count all non-prime numbers between 1 and 15: {1, 4, 6, 8, 9, 10, 12, 14, 15} = 9

So the probability is: 9/15 = 3/5

2). colA 0 5 10 25 30
colB 5 10 25 30

3) f(x)=(2x-3)(2x+3)=ax^2+bx+c

4x^2 -9 = ax^2 +bx +c

Therefore a=4, b=0 c=-9

Therefore a+b+c = 4+0-9 = -5

Therefore answer is C


4) Prime nos are 2,3,5,7,11,13 (totally 6)
Therefore 6/15=2/5

5) A 0 5 10 25 30
B 5 10 25 30

which sets mean is greater?

similar question same data with the STD Deviation of the 2

Prob that a number is non prime out of 1 to 15?

f(x)=(2x-3)(2x+3)=ax^2+bx+c

A B
a+b+c -5

6)If x and y are integers and x + y = 9, which of the following MUST BE TRUE?
A) x and y are consecutive integers.
B) If x <> 0.
C) If x > 0, then y < 0.
D) Both x and y are odd.
E) Both x and y are less than 9.

A company sold a product for x dollars in 1990. The price of the product would increase by 2.5% every year. Which of the following expressions could be used to calculate the price of the product in the year 2000?

7.)A. x * (25)^10
B. x * (0.25)^10
C. x * (1.25) ^ 10
D. x * (1.025)^10
E. x * (0.125) ^ 10

8) n is a +ve no which of the following is an integer
a)((n+1)/2)^3x+2
b)((n-2)/2)^3x+2
c)(n+1/2)^3x+2

9) there are 5 black marbels and 3 red marbles.
prob of getting exactly 1 black marble and 1 red marble
a)5/56
b)5/64
c)15/64
d)15/56
e)0.5
ans:d 15/56

prob of picking a black marble is (5/8)

now only 7 marbles are left.

10.)a rectangular aquarium base has dimensions 10*8 and height 10. aquarium is filled upto the height of 6. a solid bar is immersed into it there by increasing the water level to 7
col a:the bar dimensions
col b:100 cubics
ans i think col b


so the prob of picking a red marble is (3/7)

so the final prob of pickn a red and black ball is (5/8)*(3/7)= (15/56)

11) geometry : a right angled triangle was given which was not to scale....hypotenuse 10...and the other two sides were 6.1 and 8.1....the angle between 6.1 and 8.1 is X degrees...

column A: X degrees

column B: 90

ans is B

12) two semicircles with thier diameters coincident...outer semicircle has diameter 12 feet and inner semicircle has diameter 8 feet....the outer minus inner was painted with green paint at some cost per sq feet....and the inner was painted with red at the same cost per sq feet

column A: cost of green paint

column B: cost of red paint

ans is A

13) x=-1
find 1\x+1\x^2+1\x^3+1\x^4+1\x^5

14) a*b=b^a...this a relation
col a col b
(2*1)*k (1*k)*1
given k>0

15)col a col b

(x^2+y^2)^2 (x^2)^2+(y^2)^2

given x y r integers

16) 5) An equilateral pentagon and an equilateral triangle were given. The perimeter of pentagon is twice that of triangle.
Col A col B
Side of pentagon side of triangle

ans is A

17) geometry : a right angled triangle was given which was not to scale....hypotenuse 10...and the other two sides were 6.1 and 8.1....the angle between 6.1 and 8.1 is X degrees...

column A: X degrees

column B: 90
IS THE ANSWER FOR THIS C

18) two semicircles with thier diameters coincident...outer semicircle has diameter 12 feet and inner semicircle has diameter 8 feet....the outer minus inner was painted with green paint at some cost per sq feet....and the inner was painted with red at the same cost per sq feet

column A: cost of green paint

column B: cost of red paint

ans is B

19) two semicircles with thier diameters coincident...outer semicircle has diameter 12 feet and inner semicircle has diameter 8 feet....the outer minus inner was painted with green paint at some cost per sq feet....and the inner was painted with red at the same cost per sq feet

column A: cost of green paint

column B: cost of red paint

I guess the answer is C

20) -(0.5)^-2,-(0.5)^-1,-(0.5)^0,(0.5)^1,(0.5)^2
find the range
a)6 1/2 ie(13/2)
b)1
c)0
d)3
e)4 1/2
ans:e


21) the perimeter of 2 equilateral triangles is equal to perimeter of 1 pentagon(all sides are equal).
col a: 1 side of pentagon
col b: 1 side of triangle
ans : a


22) probality that it rains today is 0.45
col a: prob that it rains today and temp is 85 degrees
col b :0.54
ans :d


23)n<10 is a +ve number such that n^2 -n where units digit must be 0
col a:n
col b:5
ans :a(6)


24)x^2 + y^2 =7
col a:x+y
col b:x-y


25)x^2 +2x -8=0
product of 2 roots is n
col a: n
col b:-2
ans:col c


26)a rectangular aquarium base has dimensions 10*8 and height 10. aquarium is filled upto the height of 6. a solid bar is immersed into it there by increasing the water level to 7
col a:the bar dimensions
col b:100 cubics
ans i think col b


27) n is a +ve no which of the following is an integer
a)((n+1)/2)^3x+2
b)((n-2)/2)^3x+2
c)(n+1/2)^3x+2
i dont remember other options
ans:a


28) there are 5 black marbels and 3 red marbles.
prob of getting exactly 1 black marble and 1 red marble
a)5/56
b)5/64
c)15/64
d)15/56
e)0.5
ans:d 15/56


29)-1>x<1>23 is multiplied by x the max possible value something like that...
col a:-58/2
col b:blah blah.. i'm not sure bout this question
di was not easy.. it screwed my time.. so couldn't get enough time for last 5 questions with 2 mins left..
issues: parents should involve in local schools. it is important to solely leave it to professional educators.
issue topic 2: some arts n science.. blah blah..
argumrnt: nowadays employees are using internet from workstation in shopping and playing games.. so the company x decides to implement electronic monitoring system, to improve the company's progress..