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What is n^th term of a G.P.?(a) an = a + (n-1) d(b) an = a + (n) d(c) an = a*r^n-1(d) an = a*r^nThe question was asked by my school principal while I was bunking the class.Question is taken from Geometric Progression(G.P.) in portion Sequences and Series of Mathematics – Class 11

Answer» RIGHT option is (C) an = a*r^n-1

To EXPLAIN: Since EVERY term of an G.P. is r times the previous term.

i.e. an+1 = an * r = an-1 * r^2 = ….. = a1 * r^n

or an = a*r^n-1


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