If you arrive at a negative number, this should be a red flag ... Because there are only 13 grid-in questions on the SAT math section, you may find that you quickly run out of questions to ...

In 1983 the prolific conjecturer Paul Erdős posed a math problem: Take any set of numbers ... were interested in the number of distinct entries in such a grid. (By “distinct,” they meant that if a ...

Usually, big, complicated math ... grid of squares—like a sheet of graph paper that went on for eternity—and you wanted to fill it with numbers that had to be more-than-that-number squares ...

If you arrive at a negative number, this should be a red flag ... Because there are only 13 grid-in questions on the SAT math section, you may find that you quickly run out of questions to ...