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1. |
If a and b are integers of opposite signs such that (a + 3)2 : b2 = 9 : 1 and (a - 1)2 : (b - 1)2 = 4 : 1, then the ratio a : b is? |
A. | 9 : 4 |
B. | 81 : 4 |
C. | 1 : 4 |
D. | 25 : 4 |
Answer» E. | |