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Oh ok, I think i get it now. I did think of getting the sample space for the number of boys earlier on, but never tried it. Anyways, thanks :)

Hey guys, I came across a probability question in the James Ruse 1995 Trial Paper (Ques 8b). I got the first part (Answer is 121/273), but I couldn't get the second part. The question is: A school is divided into two parts: Senior school with 400 boys and 200 girls and Junior school with...

Oh yeah.....oops.....yeah i meant AC and DC generators... thanks...

Hey guys, Just to further add on...I've got a series of questions... 1. In AC motors, does the back emf keep changing it's direction, because of the fact of the alternating current reversing it's direction every half revolution? And in DC motors, the back emf is only in one direction...

lol....i only meant to say that i was wondering if there was any other method other than plain observation of the two expansions...nothing more...

Ah ok...lol.....I was wondering how you figure out the substitution, coz I thought there was a method for it.....anwyays....thanks for that..!

Hi, Can anyone try the following ques and lemme know how it's done... By giving x appropriate numerical values in the expansion of (1+x)^n, prove that: n(sigma)k=1 (-2)^k (nCk) = (-1)^n Thanks.

A copy of the notes on Witness to alwaysalternative@gmail.com would be greatly appreciated.... Thanks...!

Ahhh.......I get it now.....thanks heaps...!!

Hey guys, I dunno if this is a simple or hard question, but I cant' seem to get anywhere with trying to solve the following question: If a, b, c are the roots of the equation x^3 - x^2 + 4x - 1 = 0, find the value of (a+1)(b+1)(c+1). Please let me know if you get the answer...

Ahh...I see how it works.....Thanks a lot!!

Thanks a lot guys! The diagram really helps, and the explanations are awesome.... Thanks once again.... Just one more ques.... KFunk; in your diagram, if you're using the right hand palm rule, which way would you face the thumb (because, your fingers would point into the page in the...

Hi, I was wondering if anyone can explain to me how eddy currents work....I know there are a a lot of thread open on this topic, but none of them seem to have a diagram. I'm trying to summarise the following dot point from the syllabus, and need a diagram of on electromagnetic braking...