A) \[2000-80-1\]
B) \[-2000-84~\]
C) \[2100+19~\]
D) \[2100+19-1\]
Correct Answer: A
Solution :
(a) \[-\left( 101 \right)\times \left( -19 \right)=\left( -1 \right)\times 101\times \left( -1 \right)\times 19\] \[=101\times 19\] \[=\left( 100+1 \right)\times \left( 20-1 \right)\] \[=100\times 20-100\times 1+1\times 20-1\] \[=2000-80-1\]
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