The geometric sequence is 7, 21, 63, 189, . . . . . . . .
(Apply common ratio formula: )
(Simplify)
The common ratio of the geometric sequence is r = 3.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e06439f9716bdec056562c46d7d671b8.png\")
(Apply common ratio formula: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=97f1efbcd36c3c5d3420155f5fb5b55f.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=74edbb09ee1599864922c75192b4c45b.png\")
(Simplify) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")