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There are 3 doors to a lecture room, In how many ways can a lecturer enter and leave the room?

There are 3 doors to a lecture room, In how many ways can a lecturer enter and leave the room? Correct Answer 9

Door - 1 দিয়ে প্রবেশ করে Door 1, 2, 3 দিয়ে বের হতে পারে = 3 বার Door - 2. দিয়ে প্রবেশ করে Door 1, 2, 3 দিয়ে বের হতে পারে, = 3বার Door - 3 দিয়ে প্রবেশ করতে পারে Door, 1 2, 3 দিয়ে বের হতে পারে = 3 বার তাই তিন রুমটিতে মোট ( 3×3) = 9 ভাবে প্রবেশ ও বার হতে পারবে।

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