What is the common ratio for 100 -80 64 -51.2?

1 Answer

Common ratio is #-4/5#.

Explanation:

Common ratio is given by a term divided by its immediately preceding term and in a geometric progression this is always same and hence called common ratio.

#r = T_n/T_(n-1)= T_3/T_2 = T_2/T_1 #

Here #(-80)/100=64/(-80)=(-51.2)/64=-4/5#

Hence, common ratio is #-4/5#.