There are eight switches in a row, from left to
right, on a switch board. At least one of the eight
switches is switched on. In how many ways is
this possible, if all the switches which are
switched on are next to each other?
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Step-by-step explanation:
There are 100 people lined up outside the entry door. Each bulb is numbered consecutively from 1 to 100. So is each person. Person No. 1 enters the room, switches on every bulb, ...
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