यदि A ∶ B = 4 ∶ 5 और B ∶ C = 7 ∶ 9 है, तो A ∶ B ∶ C ज्ञात कीजिये।

1
28 ∶ 35 ∶ 45
2
25 ∶ 35 ∶ 49
3
28 ∶ 30 ∶ 49
4
25 ∶ 30 ∶ 45

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