If a, b, c are in AP or GP or HP, then \(\frac{{a - b}}{{b - c}}\) is equal to
1
\(\frac{b}{a}~or {\rm{\;}}1~{\rm{\;}}or~\frac{b}{c}\)
2
\(\frac{c}{a}~or~\frac{c}{b}~or{\rm{\;}}1\)
3
\(1~or~\frac{a}{b}~or~\frac{a}{c}\)
4
\(1~or~\frac{a}{b}~or~\frac{c}{a}\)