Counting number

What is the smallest counting number divisible by 2,5,7,8 and 15?

Correct result:

x =  840

Solution:

2 ... primenumber 5 ... primenumber 7 ... primenumber 8=23 15=3⋅5 LCM(2,5,7,8,15)=23⋅3⋅5⋅7=840  x=LCM(2,5,7,8,15)=840

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