Question

is this a math matical sequence 189,63,21,7,2 1/3,... if it is tell me what it is going by please.

Answer 1

Try dividing 189 by 63, 63 by 21 and 21 by 7. What is the result in each case?

Answer 2

get the common ratio by dividing 2nd term to first term
or whatever term as long as it is next to each other
@haydenherring

Answer 3

189, 63, 21, 7, 7/3, 7/9, 7/27, ...
The nth term is g_n = 7 * 3 ^ (4 - n) and r is 1/3.