यदि a ∶ b = 5 ∶ 9 और b ∶ c = 4 ∶ 7 हो, तो a ∶ b ∶ c का मान ज्ञात कीजिए।

1
20 ∶ 36 ∶ 63
2
20 ∶ 36 ∶ 66
3
23 ∶ 56 ∶ 63
4
20 ∶ 56 ∶ 63

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