defence exam Indian Army Nursing Assistant Mock Test Series 2025 Quantitative Aptitude Ratio and Proportion Fourth Proportional

4, a और 16a का चौथा अनुपातिक 81 है। a का मान कितना है?

1
(13)/(2)
2
(5)/(2)
3
(9)/(2)
4
(11)/(2)
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