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so you can have 7 on, 1 off. 6 on, 2 off etc. How many different combinations are possible?
or 8, depending on what you mean
Not what I said below.
It's 2 to the power n, where n is the number of switches
0, 1, 2, 3, 4, 5, 6, 7, 8
isn't it 128?
* All are on
* All are off
* Some are on
8 ladies go to 8 shops at 8 o'clock in the morning. Each lady wants to buy 8 spiders. For each spider, 8 spider shoes must also be bought. But they only have 8 pounds between them. With each spider costing 8 pence and each spider shoe costing an eighth-pence each, will the ladies have enough change for the bus home? (a journey costing 8 pence per stop and made up of 8 stops)
you look at something like this, think "I used to know how to work this stuff out", and realise that now you're just blanking?