# ?

### Probability

http://upload.ysk.cc/upload/photo/200803-120618037...

(a) Find the probability that a player can get the bookmarks.

(b) If the game stall owner expects the probability of any player winning the bookmarks to be 1/3, what is the distance (in cm) between any two parallel lines should be

changed to?

(c) In order to make the game more attractive, a player is allowed to throw another CD of diameter 6 cm but the distance between any two parallel lines is kept at 16m. If the CD of diameter 6 cm lies between two parallel lines, the player hets 3 bookmarks, otherwise he/she gets nothing. Nelson wants to get as many bookmarks as possible, which CD ( the one of the diameter 6 cm or that of diameter 12 cm ) should he choose to throw?

1 個解答數學1 十年前### maths ce mc 92 34

maths ce mc 92 34,

can someone tell me how to solve out the Q or work out the mean from c.f. curves?

1 個解答數學1 十年前### Why people in helicopter usually wear...

I am ambiguous that why people in the helicopter usually wear a kind of Ear Protector or headphone during the flying. However, what are the actual functions of it?

1 個解答其他 - 科學1 十年前### indefinite Integral

Q1) In x^2 ( x^3 + 2 )^1/2 dx

Q2) In 2x + 5 / (x^2 +5x +2)^3 dx

Hope that you can understand the Qs which was typed by me

1 個解答數學1 十年前### ADDM CIRCLE

5(a)Show that the points (-1,0) and (1,0) are on the same side of the line y=x-3

(b)Find the equations of the two circles each passing through the points (-1,0) , (1,0) and

touching the line y=x+3

(c)Find the equation of the circle which passes through A(0,4) and B(8,0) and has its centre on the x-axis.If the point C lies on the circumference of the circle, find the greastest possible area of triangle ABC.

2 個解答數學1 十年前### ADDM Circles

Q1:Find the equation of the common tangent to the circles x^2+y^2-6x-16=0 and x^2+y^2+6x-40=0

Q2:The circles C1:x^2+y^2-4x+2y+1=0 , C2:x^2+y^2-10x-4y+19=0

having a common chord AB.

P(x,y) is a variable pt such that

distance form P to centre of C1/distance from P to centre of C2=1/k (k>0)

Find the value of k if P lies on a st.line.

1 個解答數學1 十年前### maths probability

Q1Two fair dice are tossed. It is known that the sum of the two numbers obtained is an even number. Fing the probability that at least a '4' is obtained.

Q2Six balls A, B, C, D, E and F are put into six boxes numbered 1, 2, 3, 4, 5, and 6. If only one ball can be put into each box, what is the probability that ball A is not in box 1 and ball B is not in box 6?

2 個解答數學1 十年前### Application of Differentiation (20pts)

A right circular cone is inscribed in a sphere of radius Rcm.Suppose r1cm,h1cm and V1cm^3 are radius ,height and volume of the circular cone respectively.

(a)Express r1 in terms of R and h1.Hence, show that V=1/3兀h1^2(2R-h1),where 0<2R

(b)Find h1, so that the cone has the maximum volume.

(c)Suppose the sphere is inscribed in another right circular cone with radius r2cm,height h2cm and volume V2cm^3.

(1) show that V2=1/3兀R^2(h2^2/(h2-2R)), where 2R<+infinite

2 個解答數學1 十年前### Prove CE's circle

Consider 2 circles C1 and C2 respectively.

How to prove that the equation of their common chord is C1-C2.

1 個解答數學1 十年前### MATHS circle

Find the equations of the two circles which touch the two axes and pass through the point (2,1)

1 個解答數學1 十年前### About hydrotropism

Wt is the distribution of auxins in roots under the effect of water?

Hence, wt is the mechanism of hydrotropism?

1 個解答生物學1 十年前### A-maths circle

consider 4 straight lines

L1:x+y-4=0 , L2:x-y-2=0 , L3:x+y-6=0 ,L4:x-y=0

let d1,d2,d3,d4 be the perpendicular distances from a moving pt P to lines

L1-L4 respectively.then the locus of P is x^2+y^2-6x-4y+14 =k (where k is real)

Find the value of k such that the circle touches the four given lines

2 個解答數學1 十年前