GRE
The number of primes that are divisible by 9
The number of primes that are divisible by 19
AC
BC
a
18
The greatest prime factor of 490
The greatest prime factor of 500
The smallest number greater than 100 in the sequence
120
The perimeter, in inches of the figure above
300
$$(a+b)^{2}$$
$$(a-b)^{2}$$
$$\frac{R}{r}$$
1.5
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