MathDB
Working with Primes

Source:

January 24, 2006
number theoryprime numbers

Problem Statement

Two different prime numbers between 4 4 and 18 18 are chosen. When their sum is subtracted from their product, which of the following numbers could be obtained? <spanclass=′latex−bold′>(A)</span> 21<spanclass=′latex−bold′>(B)</span> 60<spanclass=′latex−bold′>(C)</span> 119<spanclass=′latex−bold′>(D)</span> 180<spanclass=′latex−bold′>(E)</span> 231 <span class='latex-bold'>(A)</span>\ 21 \qquad <span class='latex-bold'>(B)</span>\ 60\qquad <span class='latex-bold'>(C)</span>\ 119 \qquad <span class='latex-bold'>(D)</span>\ 180\qquad <span class='latex-bold'>(E)</span>\ 231
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