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1. |
If ab = 21 and $$\frac{{{{\left( {a + b} \right)}^2}}}{{{{\left( {a - b} \right)}^2}}}$$= $$\frac{{25}}{4}{\text{,}}$$then the value of a2 + b2 + 3ab is? |
A. | 15 |
B. | 21 |
C. | 25 |
D. | 27 |
Answer» C. 25 | |