The following are the proportions per 5,000 of workers observed for certain classes of defects among a number of factory workers : A = Development defects ; B = Nerve signs ;C = Mental dullness. N= 5,000 (C) = 400 ; (A) = 440 ; (AB) = 170 ; (B) = 545 ; (BC) = 228. Show that some dull workers do not exhibit development defects and state how many at least do not do so.

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