a boy asked to find the lcm of 3,5,12and anotger no. but while caluculating, he wrote 21 instead of 12 and yet came with the correct answer . what would be the fourth no.
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LMC ( 3, 5, 12, 21 ) = 420
fourth number: 420 / (3 * 5) = 28
LCM ( 3, 5, 12, 28 ) = 420 LCM ( 3, 5, 21, 28 ) = 420
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