Question

which sequence is geometric                                                                                               A 5 15 25 35        B 5 10 25 35   C 6 12 18 24    D 7 14 21 28

Answer 1

If a, b, c, d is geometric sequence, then

`(b)/(a)=(c)/(b)=(d)/(c)=const.`

A. 5; 15; 25; 35

`(15)/(5)=3;\ (25)/(15)=(5)/(3)-NOT`

B. 5; 10; 25; 35

`(10)/(5)=2;\ (25)/(10)=(5)/(2)-NOT`

C. 6; 12; 18; 24

`(12)/(6)=2;\ (18)/(12)=(3)/(2)-NOT`

D. 7; 14; 21; 28

`(14)/(7)=2;\ (21)/(14)=(3)/(2)-NOT`

Answer: None of the sequences is a geometric series.