Question

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A
5) The product of two natural numbers is 17. Then, the
sum of the reciprocals of their squares is
a) 1/289
b) 289 /290
c) 290/289 d) 289​

Answer 1

i cant understand your answer

Answer 2

Answer: c

Let two natural number is a and b

Therefore

ab=17

If a=1 then b=17

or if b=1 then a=17

First we assume a=1 and b=17

According to the question

1/1^2 + 1/17^2

=> 1/1 + 1/289

Take LCM

=> 1/1 + 1/289 = 290/289. Answer