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

You would use a permutation equation to solve this if I am reading this question correctly.

yes how to do,
26*15=390
c=15 ,p=15,f=15 so 45/390

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