3 and 4 .Determinants and Matrices
easy

$\left| {\,\begin{array}{*{20}{c}}a&b&{a - b}\\b&c&{b - c}\\2&1&0\end{array}\,} \right|=0$ હોય તો $a,b,c$ એ . . . શ્રેણીમાં છે.

A

સમગુણોતર

B

સમાંતર

C

સ્વરિત

D

એકપણ નહી.

Solution

(a) On expanding, $ – a(b – c) + 2b(b – c) + (a – b)(b – 2c) = 0$

==> $ – ab + ac + 2{b^2} – 2bc + ab – 2ac – {b^2} + 2bc = 0$

==> ${b^2} – ac = 0$

==> ${b^2} = ac$.

Standard 12
Mathematics

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