3 and 4 .Determinants and Matrices
easy

यदि कोटि $3 $ के वर्ग आव्यूह $A$  और $ B $ इस प्रकार हैं कि$|A| =  - 1,$ $|B| = 3,$ तो $|3AB|$=

A

$-9$

B

$-81$

C

$-27 $

D

$81$

(IIT-1988)

Solution

(b) $|A| = – 1,\,|B| = 3 \Rightarrow |AB| = – 3$

==> $|3AB| = {(3)^3}( – 3) = – 81$.

Standard 12
Mathematics

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