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→Useful websites
#[http://mykhmsmathclass.blogspot.com/2011/09/sum-of-first-n-terms-of-ap-problems.html Sum of first nterms of an A.P.Problems]
#[http://mykhmsmathclass.blogspot.com/2011/09/sum-of-first-n-terms-of-ap-problems.html Sum of first nterms of an A.P.Problems]
#[http://mykhmsmathclass.blogspot.com/search/label/Resources-%20Geometric%20 Progression Understanding GP]
#[http://mykhmsmathclass.blogspot.com/search/label/Resources-%20Geometric%20 Progression Understanding GP]
#[http://nimsdxb.com/wp-content/uploads/Unit-5_A.P._and_G.P._Core.pdf CBSE-i Arthimetic progression and geometric progression]
=video on progressions from youtube=
=video on progressions from youtube=