a, b, c are positive reals and are the \( l \) th, \( m \) th and \...
a, b, c are positive reals and are the \( l \) th, \( m \) th and \( n \)th
P terms of a geometric progression, respectively. If
W
\[
\overrightarrow{\mathrm{A}}=(\log \mathrm{a}) \hat{\mathrm{i}}+(\log b) \hat{\mathrm{j}}+(\underline{\log \mathrm{c}}) \hat{\mathrm{k}}
\]
and \( \overrightarrow{\mathrm{B}}=(m-n) \hat{\mathrm{i}}+(n-l) \hat{\mathrm{j}}+(l-m) \hat{\mathrm{k}} \)
then the angle between \( \overrightarrow{\mathrm{A}} \) and \( \overrightarrow{\mathrm{B}} \) is
(1) \( 60^{\circ} \)
(2) \( 45^{\circ} \)
(3) \( 30^{\circ} \)
(4) \( 90^{\circ} \)
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