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→Useful websites
#[http://mykhmsmathclass.blogspot.com/2008/05/arithmetic-progression.html Understanding A.P]
#[http://mykhmsmathclass.blogspot.com/2008/05/arithmetic-progression.html Understanding A.P]
#[http://mykhmsmathclass.blogspot.com/2011/09/deriving-nth-term-of-ap.html Formula deriving nth term of an A.P.]
#[http://mykhmsmathclass.blogspot.com/2011/09/deriving-nth-term-of-ap.html Formula deriving nth term of an A.P.]
#[http://mykhmsmathclass.blogspot.com/2011/09/using-formula-for-nth-term-of-ap.html Using formula nth term of anA.P.]
=video on progressions from youtube=
=video on progressions from youtube=