Recent content by haoku

I am having difficulty in evaluating the limit x tends to positive infinity (log( (1+[sqrt(2)/2])^x + (1-[sqrt(2)/2])^x ))/x I have tried using binomial series expansion but turn out to be something messy. Any ideas on it? :)

Sorry this is 6a

Homework Statement Given difference equation T(a+2)-7T(a+1) +6T(a)= 6f Find the general solution of this equation Homework Equations I have found the auxiliary equation be A(1)^n+B(6)^n But seems can't find the particular solution of that question. Is it impossible to do this...

Sorry I have corrected and thanks for answering!

If ds = integration of f(t) dt then can I say: ds/dt= f(t)? I am very confuse with that. please help

Homework Statement Given a "8 digit number" abcdabcd.That means 1st digit =5th digit, 2nd digit =6th digit etc. Also, note that the smallest possible "8 digit number" is 10001(i.e.00010001). Prove this by induction that it is divisible by 137. Homework Equations The Attempt at a...

Homework Statement Name of complex ion CuCl4^2- The Attempt at a Solution I wrote tetrachlorocuprate(II) ion and my teacher says it is incorrect. I should write tetrachlorocopper(II) ion

Homework Statement Do photoelectric effect suggest that the emission of energy by an atom be quantized Homework Equations The Attempt at a Solution I think it is true as photoelectric effect told us that atom emitt energy in terms of electron.

Thanks

You mean easy one : 10*9*8*7*6 =30240 hard one=10C5*5*4*3*2*1=30240 also! If order is not important, should I divide the answer by 5!?

I have asked the teacher and the teacher said each student who got 12% mark will get 1 gems and student with 60% will have 5 gems. Should the answer be 10C5?

Homework Statement There are 10 different coloured gems will be given to 6 students according to their marks. The marks of the students are 60%,12%,12%,12%,12%,12%. The number of gems obtained is according to their marks. How many ways can it distribute the gems? 2. The attempt at a...

Homework Statement A telephone survey is planning a marketing survey of its 760000 customers. For budget reasons, the company wants a sample size of about 250. a) Suggest a method for selecting a systematic sample.? b) What expense do you think is most likely to limit the sample size...

Oh yes, I have some logic error that confuse myself. Thanks

When looking at definition, C(a,b)/C(c,d) =[ a!d!(c-d)!]/[c!b!(a-b)!] P(a,b)/P(c,d)=[a!(c-d)!]/[c!(a-b)!] So, the two number is not equal.