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Anonymous
They are 1*49=49 and 7*7=49
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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
Multiples of 49.
They are: 47+2 = 49
60 and 80
Multiples of 49: 49,98,147,196,245,294,343,392,441,etc.