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In programming: They let you do generic calculations, with numbers that you don't know in advance. In algebra: They let you do calculations with unknown values - either generic calculations, or do calculations to find such unknown values in a specific case.
Jabibi the gas attendant
ummm...you really cant do tht
The chance is 50%-50% that it will be heads or tails; this does not change regardless of the number of previous tosses and their results.
two sides tht never meet