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3 and 4 .Determinants and Matrices
normal
The value of the determinant $\left| {\,\begin{array}{*{20}{c}}1&2&3\\3&5&7\\8&{14}&{20}\end{array}\,} \right|$is
A
$20$
B
$10$
C
$0$
D
$250$
Solution
(c) $\left| {\,\begin{array}{*{20}{c}}1&2&3\\3&5&7\\8&{14}&{20}\end{array}\,} \right| = 2 – 8 + 6 = 0$.
Standard 12
Mathematics