Geometrical Progression (G.P.)
A progression of numbers in which every term bears a constant ratio with its preceding term, is called a geometrical progression.The constant ratio is called the common ratio of the G.P. A G.P. with first term a and common ratio r is :a, ar, ar2,In this G.P. Tn = arn-1sum of the n terms, Sn= a(1-rn)/(1-r)
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