MathDB
Making Primes from Digits

Source:

February 11, 2008
number theoryprime numbers

Problem Statement

The digits 1 1, 2 2, 3 3, 4 4, 5 5, 6 6, 7 7, and 9 9 are used to form four two-digit prime numbers, with each digit used exactly once. What is the sum of these four primes? (A) 150(B) 160(C) 170(D) 180(E) 190 \text{(A)}\ 150 \qquad \text{(B)}\ 160 \qquad \text{(C)}\ 170 \qquad \text{(D)}\ 180 \qquad \text{(E)}\ 190
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