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dg2

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.

  • 3 months ago
  • 3 months ago

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

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

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

    • 3 months ago
  4. OpenSessame
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    Think about every step.

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

    • 3 months ago
  6. OpenSessame
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    |dw:1389783816216:dw| Remember this too

    • 3 months ago
  7. dg2
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    how staircase only two

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

    • 3 months ago
  9. dg2
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    k tell me how to do

    • 3 months ago
  10. dg2
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    2 staircase,4 doors,15 seats for each row

    • 3 months ago
  11. dg2
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    15c1/390

    • 3 months ago
  12. dg2
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    15c1*4c1*2c1=120

    • 3 months ago
  13. dumbcow
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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

    • 3 months ago
  14. dg2
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    whether it is correct r not how to check

    • 3 months ago
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