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I remember doing this problem a few days back..
you mathmate and me

why did u exclude last station B . It should be total 10 stations.

You don't need a ticket to go from B to B!

Oh, if you mean getting on at A, that's also excluded, it says passengers get on between A and B.

i m sill confused as what this question asks

|dw:1442321071084:dw|

so we don't know how many station exactly there between A and B but at least there is 9

9 stops mean 9 stations

-.- hehehe sorry i missread

the answer is A 45C7

9! =45

wait i didnt read the last part about 2 ppl not buying the same ticket

answer given in book is 45c7

yea i was thinking 2 pp not buying the same ticket wont matter

so yea basically 9+8+7+6+5+4+3+2+1=45 and there is 7 passengers so 45C7