question_answer

If \['\alpha '\] stands for\['-','\beta '\] stands for\['+','\gamma '\] stands for \['\times '\] and \['\delta '\] stands for'-', then which of the following is incorrect?

A)  \[137\alpha \,56\,\alpha \text{ }3\gamma \text{ }4\beta \text{ }5\alpha \text{ }8\gamma 8=-2\]         

B)  \[~56\delta \text{ }28\gamma \text{ }19\alpha \text{ }8\alpha \text{ }15\beta 3=20\]

C)  \[23\alpha \text{ }14\beta \text{ }15\gamma \,9\delta 9=-6\]              

D)  All of these