Let x, y and z be distinct positive integers satisfying x < y < z and x + y + z = k. What is the smallest value of K that does not determine x, y, z uniquely?
Explanation:
In this case since x, y and z are distinct positive integers, our aim is figure out which of the answer choices cannot be expressed as the sum of 3 integers uniquely.
For eg. 6 can only be expressed as (1 + 2 + 3).
7 can only be expressed as (1 + 2 + 4).
But 8 can be expressed as either (1, 2, 5) or (1, 3, 4).
Hence, option (d).
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