Q2 of 110 Page 48

Find the 10th term and common ratio of the geometric sequence .

Given:


; (where, n = 1,2,……n-1)


Now, taking n = 3.




⇒ r = -2


Also, an = a1rn-1 (n = no. of term and a1 = first term of G.P)


∴ 10th term (a10 = a1r9)




⇒ a10 = -27


⇒ common ratio = -2 and 10th term = -27


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