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What is the HCF of 9/10,12/15, 18/35 and 21/40 is :
3/5
252/5
1/280
63/700
HCF for fractions = HCF of Numerators / LCM of Denominators HCF of 9/10,12/15, 18/35
and 21/40=HCF (9,12,18,21) / LCM (10,15,35,40)
= 3/840=1/280
Hence, option 3 is the correct answer.
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