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Double Angle Formula: <a href="http://www.codecogs.com/eqnedit.php?latex=\frac{2tanx}{1-tan^2x} = tan2x" target="_blank"><img src="http://latex.codecogs.com/gif.latex?\frac{2tanx}{1-tan^2x} = tan2x" title="\frac{2tanx}{1-tan^2x} = tan2x" /></a> So if <a...

I have another question. Q37 from Exercise 10E in the Cambridge 3 unit text. "Numbers less than 4000 are formed from the digits 1, 3, 5, 8 and 9, without repetition. d) how many of them are divisible by 3?" so far i had: for 3XXX numbers, this includes 3! arrangements with the numbers 951...

Thanks for your help iampeterr and deswa1. I think I'll stick to solving the questions your way rather than trying to solve them in a convoluted way.

This is from the Cambridge 3 unit Year 12 textbook (Exercise 10E Q22): "In how many ways can a boat crew of eight women be arranged if three of the women can only row on the bow side and two others can only row on the stroke side?" So far I have: You need 4 women on the bow side and 4 on the...