Question

suppose that 3rd term of geometric sequence is 27 and 5th term is 243 find the first term and common ratio of sequence

Answer 1

Answer:

2 1 is the right answer....

Answer 2

Answer:

Ratio of 5th and thir term is 243/ 27 = 9 .

This must be r square so

r = 3  ( this is called common Ratio)

Now thrid term is b x r x r = 9b= 27

b= 3

so first term is 3 , CR = 3.