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Re: How did people go in the maths comp today? hahaha, did the same thing!! Overall, thought the first dozen or so weren't too bad, then skipped a couple of the middle ones (16 and 19, guessed at the end). Got the traitors-loyalists one and I'm pretty sure one more from 21-25. Hopefully...

No Probs! :)

correct

Sodium hydroxide is not suitable for use as a primary standard - it is hygroscopic (absorbs water molecules from the air) and as such is difficult to obtain and maintain in a very pure form. Also, it has a relatively low molar mass, and this is more likely to lead to errors in calculation down...

OK, the Balance of Payments will balance, therefore the deficit of one account will equal the surplus of the other. The only complete account is the capital and financial account, which is 17+13 = 30 in surplus. Therefore the current account is 30 in deficit. From the BoGS and net...

That situation is not important, as the women must be "in between TWO men"

Agreed with above, a tree diagram is the go for number one: Pretty sure you end up with P=4(2/21) + (1/14) = 19/42 As for number 2, a T.D. is probably unnecessary: a) P = 4/52 * 3/51 * 2/50 b) P = 4/52 * 4/52 * 4/52 3. And for this, method is up to you, I like using...

1. Looks right, 2. Again, looks right - there is only one correct choice, but there are 9*8*7 possible outcomes, therefore 1/504 3. I'm pretty sure this is wrong. Reading the question, I get the impression that the first choice of card is unimportant. You could choose any card and it...