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The formula used to calculate the diameter of a wire by the screw gauge having zero error is ?

a. P.S.R + H.S.R

b. P.S.R+H.S.R. X LC + or - correction

c. P.S.R.+H.S.R X L.C

d. P.S.R-H.S.R

 
 
 
 
Answer : b