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I never heard of it before and wikipedia didn't help.
http://www.math10.com/en/algebra/arithmetic-progression.html#calc
That website explained in to me quickly and clearly. Suggest it to everyone who is stuck.
Hi! Thanks for suggestion!
For this problem Wikipedia is not supposed to give you straight answer - instead user is expected to think a bit on programming approach or math formula... :)
And of course it is supposed that anyone can find some more articles to read if necessary - like you did it :)
Nevertheless thanks for the link - I hope this really could be helpful for those who feel stuck!
(the main reason behind referencing to wikipedia rather than some other sites is that there is less chance the link will become invalid one day in future - not that I am particularly fond of some specific wikipedia article...)