Ginger tea you still have 50:50 chance of winning after calling, as the other half of possibilities are excluded :S
i should have worded that one more clearly
if person a is making the call but person b is making the prediction of the call AND the outcome then its not 50:50
you could be right on the call and wrong on the outcome or right or wrong on both counts
if its just peron a and the coin then it is 50:50
same as if you predicted if a car (that isnt indicating) would turn left or right at a t junction (providing that the driver doesnt drive straight on that is ;) )
as for the curious incident book
some of it i enjoyed, the odd maths bit, but ive read better "i wish i had these books when i was at school" books. i may not understand alot of em (as my maths teacher felt it would be better to give her class calculators as early as possible so i cant do sums in my head or long division etc ... its calculator all the way) but i enjoyed the way the books were written as mini problem stories (pitty they are all in storage oop norf)
and other times i think the book is one of the worst uses of a rainforest going