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ANKUR GUPTA Grade: 12
        

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

7 years ago

Answers : (1)

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)
7 years ago
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