Answer :

Answer:

17

Step-by-step explanation:

85 div 17 = 5

153 div 17 = 9

No higher number

Answer:

17

Step-by-step explanation:

factors of 85 : 1, 5, 17,85

factors of 153 :1 , 3 , 9 , 17, ..

HCF = 17

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