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If a = p / (p + q) and b = q / (p - q), then and ab/a + b is equal to

pq / (p2 + q2)
(p2 + q2) / pq
p / (p + q)
[p / (p + q)]2

Correct Answer: pq / (p2 + q2)

Explanation:

ab/(a + b) = [p/(p + q)] x [q/(p - q)] / [p/(p + q) + q/(p - q)]
= pq/p² - pq + pq + q²
= pq/(p² + q²)

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