Find the common factors of : (a) 4, ...

Find the common factors of : (a) 4, 8 and 12 (b) 5, 15 and 25

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(a) factors are :
`4 = 1,2,4`
`8 = 1,2,4,8`
`12 = 1,2,3,4,6,12`
common factors `= 1,2,4`
(b) factors are :
`5 = 1,5`
`15= 1,3,5,15`
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