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` 

+ Answer
C 

+ Explanation
solution
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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Md. Habib Ullah

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