so u had 5C3(1/4)^2 (3/4)^3 ?
One mark probably, but that would carry on to part ii) so 2 marks lost altogther out of 5.
I actually had 5C2 and i wsn't sure which one it was, but they're equal which is good.
If u calculate it, it's quite a small fraction, which i wrote down. I think...