यदि a ∶ b = 2 ∶ 5 और b : c = 3 ∶ 4, तो a ∶ b ∶ c का मान ज्ञात कीजिए।

1
6 ∶ 16 ∶ 21
2
2 ∶ 5 ∶ 7
3
6 ∶ 15 ∶ 20
4
3 ∶ 8 ∶ 10

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