जर A ∶ B = 5 4, B ∶ C = 6 5, C D = 7 10, तर A ∶ D चे मूल्य किती असेल?

1
21 ∶ 25
2
7 ∶ 3
3
21 ∶ 20
4
25 ∶ 24

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