2002 AMC 12A Problems/Problem 17

Problem

Several sets of prime numbers, such as $\{7,83,421,659\}$ use each of the nine nonzero digits exactly once. What is the smallest possible sum such a set of primes could have?

$\text{(A) }193 \qquad \text{(B) }207 \qquad \text{(C) }225 \qquad \text{(D) }252 \qquad \text{(E) }447$

Solution

Neither of the digits $4$ , $6$ , and $8$ can be a units digit of a prime. Therefore the sum of the set is at least $40 + 60 + 80 + 1 + 2 + 3 + 5 + 7 + 9 = 207$ .

We can indeed create a set of primes with this sum, for example the following set works: $\{ 41, 67, 89, 2, 3, 5 \}$ .

Thus the answer is $\boxed{207}$ .

2002 AMC 12A (Problems • Answer Key • Resources)
Preceded by Problem 16	Followed by Problem 18
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2002 AMC 12A Problems/Problem 17

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