Which of the following expressions is necessarily equal to 1?
Explanation:
Using the values from previous answer,
Option 1 = (y − z)/(y − z)
Option 2 = (z − y)/(y − x)
Option 3 = (x − y)/z
Option 4 = (y − z)/y
It can be easily concluded that the expression in option 1 is necessarily equal to 1.
Hence, option (a).
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