AMC / AIME · Divisibility · Medium
Divisibility: How many integers from math to math are divisible by math but not by math?
Factors and gcd/lcm.
Try the problem
How many integers from to are divisible by but not by ?
Hint and answer
Concept to use
gcd/lcm.
Hint
Use lcm/gcd and count multiples carefully.
Answer
13
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