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1/8*1/9
so 1/72

it's wrong isn't it

i'm thinking of a different question.
oh, right, yea. that i think makes much more sense

no! no! I got it now!
hard centred: 8/17
soft centred: 9/17
multiply these together
72/289

Yeah that sounds a bit better... been a while since i've done one of these.

do you multiply that by 2?

yea, me too! been like 3 months

Hmm i'm not sure if that's correct. It may be easier to do it using combinations...

use a tree diagram, i'll draw one

There's four possible outcomes: (h, h), (s,s), (h,s), (s,h)

(note not all are equally likely as there's 8 hard and 9 soft)

yea, it does

so basically in the end, you did need to multiply it by 2 ;)

Yep, but your original equation had them both over 17, not one over 17 and one over 16.

right, no replacement! Sorry, it's been a while

is it the rite ans

agent's is the right answer, follow his equation