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dg2

  • one year ago

A classroom has 26 rows (From A to Z), each row is divided in three columns and each column has five seats. To enter in the class, four doors (D1, D2, D3 and D4) are available and reaching up to the door two stairs (LH & RH) are available. A student wants to take the seat in the row C, F or P and then in how many ways he can get the seat.

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  1. OpenSessame
    • one year ago
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    There are four doors and and two stair cases to each door, correct?

  2. OpenSessame
    • one year ago
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    You would use a permutation equation to solve this if I am reading this question correctly.

  3. dg2
    • one year ago
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    yes how to do, 26*15=390 c=15 ,p=15,f=15 so 45/390

  4. OpenSessame
    • one year ago
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    Think about every step.

  5. OpenSessame
    • one year ago
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    First you must choose which stair case, there are 8. Then which door, 4 and so on.

  6. OpenSessame
    • one year ago
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    |dw:1389783816216:dw| Remember this too

  7. dg2
    • one year ago
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    how staircase only two

  8. OpenSessame
    • one year ago
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    i thought it was 2 stairs for every door sorry!

  9. dg2
    • one year ago
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    k tell me how to do

  10. dg2
    • one year ago
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    2 staircase,4 doors,15 seats for each row

  11. dg2
    • one year ago
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    15c1/390

  12. dg2
    • one year ago
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    15c1*4c1*2c1=120

  13. dumbcow
    • one year ago
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    yes however there are 3 rows (C,F,P) possible which means there are 45 seats to choose from --> 45*4*2 = 360

  14. dg2
    • one year ago
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    whether it is correct r not how to check

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