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Well, 4•1=4 4•2=8 and so on so 4•5=20. 20 is divisible by 10 (10•2=20) therefore 20 is the least common mutiple
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Well, 4•1=4 4•2=8 and so on so 4•5=20. 20 is divisible by 10 (10•2=20) therefore 20 is the least common mutiple