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it's related to the 'monty hall' question, where you have 3 doors one with the prize behind it, and you choose 1 of them initially, then the host will show you the empty one out of the remaining 2 and you are given a chance to switch, should you switch or not? both showing red ball and the...

use Z' for conjugate of Z.

the proof is easy.. but takes 1.5 mins to write down

hint: do it the old fashion way.. list down the possible sample space at first I thought it was same as (i) but.. there's a subtle difference, see if you can spot it

that's the fun part.. given the answer is 1/5, try to make sense out of it :) my math teacher caught me off guard today with this..

archman got it !

2/3? thats getting colder

not 1/6 either

erh.. depends.. I would say 1-2 marks .. no proof required 3+ prove

c'mon guys/gals it's not 1/2 not 1/3 not 1/8

no.. the 2 balls are first drawn and then one fell down

part c meant that after drawing the 2, 1 falls and it was seen to be red.

part b is 1/2 part c is wrong

hmm....... I tried to do that from the start of the year.. didn't manage to finish

try again, one of your answers is wrong

this is from a 2 unit exam, see how many of you can do it there are 2 red, 1black and 1 white marbles in a bag. two marbles are drawn one after the other, and kept hidden in a hand. a) find the probability that that 2 red marbles are drawn b) find the probabilty that the second marble...

EMR... erh.. they're talking about the lines emitting radiowaves of 50 Hz.. forget it.. that very little compared to magnetic induction

just study, any paper is good as any other. I recommend textbooks though

I mean.. maths doesn't change.. a 1913 papr is just as good

no difference