railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Ratio and Proportion Third Proportional

य़दि 1.2 ∶ 3.9 ∶∶ 2 ∶ a है, तो a का मान ज्ञात करें। 

1
6.5
2
6.9
3
6.3
4
6.1 
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