A) 61
B) 93.5
C) 693.5
D) 642
Correct Answer: C
Solution :
\[2\Delta 3\Rightarrow (2\times 3)+\left( \frac{2+3}{2} \right)=8.5\] \[4\Delta 9\Rightarrow (4\times 9)+\left( \frac{4+9}{2} \right)=42.5\] \[8\Delta 6\Rightarrow (8\times 6)+\left( \frac{8+6}{2} \right)=55\] \[\therefore 18\Delta 37\Rightarrow \left( 18\times 37 \right)+\left( \frac{18+37}{2} \right)=693.5.\]You need to login to perform this action.
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