1.

If\[\mathbf{a}\text{ }=\text{ }\mathbf{b}\], then which one among the following cannot be true?

A. \[a+c=b+c\]
B. \[2a+c-d=2b+c-d\]
C.  \[a+2b=2a+b\]
D.  \[a\text{ }+\text{ }2b\text{ }+\text{ }3c\text{ }=\text{ }3c-a\text{ }+\text{ }2b\]
E.  None of these
Answer» E.  None of these


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