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If she Enters through a particular door then she can exit from remaining 6 doors in this way 6 unique entries for one door........there are 7 doors.....Thus 7×6 total 42 unique entries
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42............ .......
how 42 if you don't explain how will i understand
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she can enter the room in 42 different ways..
when she enters from one door, then she can exit through through 6 different doors. in total in this way she can do this 7 times. so to know the no. of ways she can enter and exit, we should multiply 6 with 7 so we get 42 different ways.
when she enters from one door, then she can exit through through 6 different doors. in total in this way she can do this 7 times. so to know the no. of ways she can enter and exit, we should multiply 6 with 7 so we get 42 different ways.
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