The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: Choices:
A) 1/289	B) 289/290	C) 290/289	D) 289	E) 300
Explanation:   Let the numbers be a and b. Then,   ab = 17, a = 1 and b = 17   So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2   = (12 + 172)/(1 * 17)2 = 290/289   ANSWER IS 290/289
<result>C</result>
The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: