railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra Identities

यदि 16a4 + 36a2b2 + 81b4 = 91 और 4a2 + 9b2 – 6ab = 13 है, तो 3ab का मान क्या है?

1
5
2
–3
3
3/2
4
–3/2
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