state gov WBPSC Clerkship Mock Test 2023 - 24 Quantitative Aptitude Ratio and Proportion

If \(\frac{a}{b}=\frac{7}{9}, \frac{b}{c}=\frac{3}{5}\), then the value of a ∶ b ∶ c is

1
7 ∶ 9 ∶ 15
2
7 ∶ 9 ∶ 5
3
21 ∶ 35 ∶ 45
4
7 ∶ 3 ∶ 15
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