Question

Find the missing term in the
geometric sequence.
13,[ ? 1,208

Answer 1

?=52 or ?=-52

Explanation:

Find the geometric mean:

?=sqrt(13*208)

?=sqrt(2704)

?=±52

So ? can be either 52 OR -52. Keep in mind that since we have an odd number of terms in the sequence, -52 is a possible missing term.

13*4=52, 52*4=208

13*-4=-52, -52*-4=208