the h c f of 9 10 12 25 18 35and, HCF & LCM, General Mathematics

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Question:The H.C.F. of  $9/10$ , $12/25$ , $18/35$ and  $21/40$  is :

A  $3/5$  
B  $252/5$  
C  $3/1800$  
D  $63/700$

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+ AnswerC

+ Explanationsolution
H.C.F. = $(H.C.F. of 9,12,18,21)/(L.C.M. of 10,25,35,40)$ = $3/2800$

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Question:The H.C.F. of 9109/10,122512/25,183518/35and 214021/40 is :