a ∶ b = 3 ∶ 4, b ∶ c = 2 ∶ 3 మరియు c ∶ d = 5 ∶ 6 అయితే, a ∶ b ∶ c ∶ d :

1
15 ∶ 20 ∶ 35 ∶ 36
2
10203036
3
15203036
4
15253036

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