a : b = 4 : 7 এবং b : c = 5 : 6 হলে a : b : c = কত? 

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A

4 : 7 : 6 

B

20 : 35 : 24 

C

20 : 35 : 42 

D

24 : 35 : 30

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Updated: 1 month ago

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