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Let 'p' any point on x-y+3=0 and 'A' be fixed point (3,4). If the family of lines givne by `(3sectheta+5cosectheta)x+(7sectheta-3cosec theta)y+11(sectheta-cosec theta)0` are concurrent at B for all permissible value of '`theta`' and maximum of `abs(PA-PB)=2sqrt2n(n in N)` then n =

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