state gov DSSSB Junior Assistant, Steno and LDC Mock Test 2023 - 24 Quantitative Aptitude Algebra Identities
If a4 + b4 + a2b2 = 273 and a2 + b2 - ab = 21, then one of the value of \(\left(\frac{1}{a}+\frac{1}{b}\right)\) is:
1
\(\frac{3}{2}\)
2
\(\frac{9}{8}\)
3
\(-\frac{3}{4}\)
4
\(-\frac{9}{4}\)