Question 23
How many three-digit positive integers $a$ make $\frac{a^2-7}{a^2-4}$ a fraction in lowest terms?
Answer format: enter one whole number without units. The source answer sheet uses four digits with leading zeros if needed; ordinary numeric entry is used here.
Answer format: enter one whole number without units. The source answer sheet uses four digits with leading zeros if needed; ordinary numeric entry is used here.