There are 71 multiples altogether here. Some of them are 7, 14, 21.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The first 3 multiples of 17 are: 17, 34, 51
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
The first 3 COMMON multiples of 17 will depend upon the OTHER NUMBER(S) with which 17 has common multiples. However, they will be regularly spaced within the multiples of 17.eg the first 3 COMMON multiples of:1 and 17 are 17, 34, 51;2 and 17 are: 34, 68, 102;5 and 17 are: 85, 170, 255;17 and 34 are: 34, 68, 102etc.
21
Multiples 21: 1,3,7,21Multiples 49: 1,7,49
There are 71 multiples altogether here. Some of them are 7, 14, 21.
All multiples of 17 are divisible by 17. There is an infinite number of multiples of 17.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The common multiples of 3 and 21 are 21, 42, 63 and so on.
The first 3 multiples of 17 are: 17, 34, 51
The first five multiples of 21 are: 21, 42, 63, 84, 105.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
Factors: 1 and 17 Multiples: 17, 34, 51, 68 and so on.
Factors of 21 = 1, 3, 7, 21 Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
Factors: 1, 3, 7, 21 Multiples: 21, 42, 63, 84 and so on.