A) \[_{n}{{X}^{m-4}}\]
B) \[_{n-2}{{Y}^{m-4}}\]
C) \[_{n-4}{{Z}^{m-4}}\]
D) \[_{n-1}{{Z}^{m-4}}\]
Correct Answer: D
Solution :
\[_{n}{{X}^{m}}{{\xrightarrow{\alpha }}_{n-2}}{{X}^{m-4}}{{\xrightarrow{-\beta }}_{n-1}}{{X}^{m-4}}\]
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