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Best Answer
'6'
Method
Factors of 18 are 2,3,6,9,
Factors of 30 are 2,3,5,6,10,15,
Factors of 48 are 2,3,4,6,8,12,24,
2,3 & 6 appear in all three factorisations.
Hence '6' being the largest /highest number , then '6' is the HCF (Highest Common Factor).
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