There are 5 doors to a lecture room. In how many ways can a student enter the room through a door and leave the room by a different door?

There are 5 doors to a lecture room. In how many ways can a student enter the room through a door and leave the room by a different door? ?

Created: 1 week ago | Updated: 1 week ago | Created By:

Imran Ahmed

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Best Answer Explained in Below-:

To enter the room through one door and leave through a different door, you can choose from 5 doors for entering and then choose from the remaining 4 doors for leaving.So, the total number of ways a student can enter and leave through different doors is 5 (choices for entering) × 4 (choices for leaving) = 20 ways.Therefore, the correct answer is 20.

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There are 5 doors to a lecture room. In how many ways can a student enter the room through a door and leave the room by a different door? ?

What is the annual interest rate on an account that carns Tk. 948 in simple interest over 36 months with an initial deposit of Tk. 7900?

If machine A polishes x units in 12 minutes and machine B polishes 5x units in 40 minutes, in how many minutes will A and B. working together, polish 50x units?

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