a ∶ b = 3 ∶ 7 మరియు b ∶ c = 4 ∶ 9 అయితే, a ∶ b ∶ cని కనుగొనండి.

1
3 ∶ 28 ∶ 63
2
3 ∶ 28 ∶ 9
3
12 ∶ 28 ∶ 63
4
12 ∶ 28 ∶ 9

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