Let A be the set of natural numbers multiples of 20 and B the set of natural numbers multiples of 15. Which is the set A ∩ B? A.natural numbers multiples of 60 B. natural numbers multiples of 5 C. natural numbers multiples of 300 D. natural numbers multiples of 30
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By definition we have the following: A={20k∣k∈N}={20,40,60,80,100,120,140,…}B={15n∣n∈N}={15,30,45,60,75,90,105,120,…}A∩B={60,120,180,…}={60m∣m∈N}Answer = A. Natural numbers multiples of 60