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Question

If $(a - b) : (a + b) = 1 : 5$ , then what is $(a^{2} - b^{2}) : (a^{2} + b^{2})$ equal to?
$2 : 3$
$3 : 2$
$5 : 13$
$13 : 5$

A

2 : 3

B

3 : 2

C

13 : 5

D

5 : 13

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