Divide any term by the previous term
Use (r = frac{a_{n}}{a_{n-1}})
Use (r = frac{a_{2}}{a_{1}})
Check that the ratio is the same for all consecutive terms
If terms are (a, ar, ar^2, ar^3), then the common ratio is (r)
Divide any term by the previous term
Use (r = frac{a_{n}}{a_{n-1}})
Use (r = frac{a_{2}}{a_{1}})
Check that the ratio is the same for all consecutive terms
If terms are (a, ar, ar^2, ar^3), then the common ratio is (r)