which of the following is not an arithmetic sequence
a. 4 8 12 16
b. 5 10 15 20
c. 3 9 27 81
d. 7 12 1722​


Sagot :

Answer:

c

Step-by-step explanation:

a,b, and d, have an exact interval which is 4, 5, and 5 respectively. However, C doesn't have a regular interval just like other choices. It's a geometric sequence not an arithmetic sequence.