ଯଦି A ∶ B = 2 ∶ 3, B ∶ C = 5 ∶ 7 ଏବଂ C ∶ D = 3 ∶ 10, ତେବେ  A ∶ D କେତେ ହେବ ?

1
1 ∶ 7
2
2 ∶ 7
3
1 ∶ 5
4
5 ∶ 1

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