A) \[146\]
B) \[21\]
C) \[20\]
D) \[335\]
Correct Answer: C
Solution :
\[\left| \begin{matrix} 215 & 342 & 511 \\ 6 & 7 & 8 \\ 36 & 49 & 54 \\ \end{matrix} \right|\] \[=215(378-392)-342(324-288)\] \[+511(294-252)\] \[=-215\times 14-342\times 36+511\times 42\] \[=-3010-12312+21462\] \[=6140\] Which is exactly divisible by 20.You need to login to perform this action.
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