engineering recuitment JCI Junior Assistant Mock Test Series 2024-25 Quantitative Aptitude Algebra Identities

If \(\frac{{{\rm{a}}\,{\rm{ + }}\,{\rm{b}}}}{2}\) = 4 and ab = 7, then the value of (a - b) =

1
±4
2
±6
3
±8
4
±9
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