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smc

algebra senior

Problem

If we write for all such that , the smallest value we can use for is:
(A)
(B)
(C)
(D)
Solution
There are two cases: (i) and (ii) . In case (i), , so . In case (ii), , so . Because in case (i) can take a larger value, we use it to determine the upper bound for under the given restrictions. Now, we can see that , which is answer choice .
Final answer
D