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SSAT Middle Level
Quantitative (Math)

Identifying Unique Numbers

Very Hard Number And Operations Whole Numbers

A unique number is defined as a number that cannot be expressed as the sum of two or more whole numbers, except for itself. Consider the following numbers: 2, 3, 5, 7, and 11. Identify which of these numbers is unique.

To determine this, calculate the sum of any two whole numbers and check if they can equal the given number, or examine relationships among the primes to see if any can form combinations or sums yielding results equal to the unique number.

Hint

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