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Let l denote the set of all integers and...

Let l denote the set of all integers and A=`{(a,b):a^2+b^2=28, a,b in I}` B=`{(a,b):a gt b ,a,b in I}` then no of elements in `AnnB` is

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A=>(a,b):`a^2=3b^2=28`
`b=1`
`a^2+3=28`
`a=sqrt(28-3)=pm5`
`B=(a>b)(a,b)`
`A nn B=>{(5,1):(5,-1):(4,2):(4,-2):(1,-3)}`.
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