1.

Which of the following statements is correct? \[\begin{align}  & (i)\ \ \ \ 6+6=0 \\  & (ii)\ \ \ 17-17=0 \\  & (iii)\ \ 5+0=5 \\  & (iv)\ \ 23-0=23 \\ \end{align}\]

A.  Only (i) and (ii)          
B.  Only (ii) and (iii)
C.  Only (ii), (iii) and (iv)
D.  Only (i), (ii) and (iv)
Answer» D.  Only (i), (ii) and (iv)


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