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