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Grade: 12 
        
The number of pairs of positive integers (x,y) where x and y are prime numbers and x2-2y2=1 is.........
10 years ago

Answers : (1)

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anandpal shekhawat
8 Points 
							Hi,
according to me
  it has only one pair (3,2)
 as y = +-[(x^2 -1)/2]^1/2
 checking for eqn. we got
  (x,y) = (3,2)
10 years ago
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