mathmath333
  • mathmath333
A train is running from station A to station B. 7 people enter the train between A and B. 9 stops are their between A and B. In how many ways can the tickets be purchased if no restriction is their with respect to number of tickets .2 people donot buy the same ticket .
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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mathmath333
  • mathmath333
\(\large \color{black}{\begin{align} & \normalsize \text{ A train is running from station A to station B.}\hspace{.33em}\\~\\ & \normalsize \text{ 7 people enter the train between A and B. }\hspace{.33em}\\~\\ & \normalsize \text{ 9 stops are their between A and B.}\hspace{.33em}\\~\\ & \normalsize \text{ In how many ways can the tickets be purchased}\hspace{.33em}\\~\\ & \normalsize \text{ if no restriction is their with respect to number}\hspace{.33em}\\~\\ & \normalsize \text{ of tickets .2 people donot buy the same ticket .}\hspace{.33em}\\~\\ & a.)\ 45C7 \hspace{.33em}\\~\\ & b.)\ 63C7 \hspace{.33em}\\~\\ & c.)\ 56C7 \hspace{.33em}\\~\\ & d.)\ 52C7 \hspace{.33em}\\~\\ \end{align}}\)
ganeshie8
  • ganeshie8
I remember doing this problem a few days back.. you mathmate and me
mathmath333
  • mathmath333
"I remember doing this problem a few days back.. you mathmate and me" by that logic answer should be 55C7 which is not in options

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More answers

mathmate
  • mathmate
9 stations between A and B from where passengers get on. So there are 9+8+7+6+5+4+3+2+1=45 ways to buy tickets, depending on where the passenger gets on. Now there are 7 passengers, so can you do the rest?
mathmath333
  • mathmath333
why did u exclude last station B . It should be total 10 stations.
mathmate
  • mathmate
You don't need a ticket to go from B to B!
mathmate
  • mathmate
Oh, if you mean getting on at A, that's also excluded, it says passengers get on between A and B.
mathmath333
  • mathmath333
i m sill confused as what this question asks
mathmate
  • mathmate
Example: |dw:1442320549526:dw| Say there are 3 stations between A and B, AND if passengers get on at the intermediate stations ONLY, then the number of tickets equal Numbers like #2 means second station after A. 3 (#1-#2, #1-3,#1-B)+ 2 (#2-#3, #2-B) + 1 (#3-B) =6 If there are 3 passengers, then there are 6C3 ways to buy tickets.
anonymous
  • anonymous
|dw:1442321071084:dw|
anonymous
  • anonymous
so we don't know how many station exactly there between A and B but at least there is 9
mathmath333
  • mathmath333
9 stops mean 9 stations
anonymous
  • anonymous
-.- hehehe sorry i missread
anonymous
  • anonymous
the answer is A 45C7
anonymous
  • anonymous
9! =45
anonymous
  • anonymous
wait i didnt read the last part about 2 ppl not buying the same ticket
mathmath333
  • mathmath333
answer given in book is 45c7
anonymous
  • anonymous
yea i was thinking 2 pp not buying the same ticket wont matter
anonymous
  • anonymous
so yea basically 9+8+7+6+5+4+3+2+1=45 and there is 7 passengers so 45C7

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