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1. ### Maths problem: i don't know how to do (c), it 's so difficult, thanks?

...12, so y = 48/12 = 4. (b) The number of black balls is 48 - x - y = 48 - 3 - 4... number be n. After taking out n black balls, there are (48 - n) ...

分類：科學及數學 > 數學 2020年09月13日

2. ### Probability Problem? ?

Q1)  設事件 E 代表 the first ball drawn is blue, 事件 F 代表 the second drawn is red. P{E∩F} = 2/5 × 3/4 = 3/10 P{F} = P{E∩F} + P{E'∩F...

分類：科學及數學 > 數學 2020年06月29日

3. ### How to improve maths ?

...confidence is 100% the name of the game in Math... problem, do not "map out a path from problem-to-answer...see this almost every day. It is very common when someone... anything down. Take Algebra for example...

分類：科學及數學 > 數學 2016年07月14日

4. ### how to do hw faster?

... not tempted to look at it while doing homework. Tell... and get them out of the way, then you can breeze through the...behind you. Have a snack and take a break for supper. Work steadily...

分類：科學及數學 > 數學 2017年04月18日

5. ### About factoring a polynomial of degree 3?

a) 8x³ - 27 = (2x)³ - 3³ = (2x - 3) [(2x)² - 2(2x)(-3) + (3)²) = (2x - 3)(4x² + 6x + 9) b) 16x³ - 4x - 48 = 2[x³ - 2x - 24] = 2[(x³ - 27) - 2x - 24 + 27] = 2[(x³ - 27) - (2x - 3)] = 2[(2x - 3)(4x² + 6x + 9) - (2x - 3)] = 2(2x - 3...

分類：科學及數學 > 數學 2015年09月11日

6. ### Prob & expected value (40分!!)

... or clubs. 4 of the above are royal. ...if you know Bayes well, it wouldn't be a hard one...go home to get umbrella, and then take taxi back to work Case...a while to figure them out .

分類：科學及數學 > 數學 2015年04月23日

7. ### Markov Chain problems

If you can wait, you should extend the question and I will do it in the weekend. Q3 is just solving the vector from the TPM...

分類：科學及數學 > 數學 2015年04月14日

8. ### F2 Math problems

1 12 x (1 x 9 x pi) = x2 x pi x 20 108 = 20x2 x = 2.32 2 Area of OAB r2 x pi x l/(2r x pi) = r x l / 2 Area of CDE r x l / 2

分類：科學及數學 > 數學 2014年08月18日

9. ### Statistics Mode

4 modes for {1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4} 4 modes for {1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4, 5} They are both discrete distributions. So, they should have definite modes. http://en.wikipedia.org/wiki/Mode_(statistics) 2014-03-26 12:46:47 補充： 0 modes...

分類：科學及數學 > 數學 2014年04月08日

10. ### maths problem15point(奥數X2)easy

...answer is 119! hope can help u 2014-02-06 11:15:24 補充： ka ho ,the step of the first question i don't understand 2014-02-06 11:17:55 補充： why you...

分類：科學及數學 > 數學 2014年02月25日

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