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Please show formula a use Four hundred melanoma patients were diagnosed according to the type of skin cancer and the location of the skin cancer.

Please show formula a use

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Four hundred melanoma patients were diagnosed according to the type of skin cancer and the location of the skin cancer. This data is presented below. What proportion of patients had superficial spreading melanoma? Location Type Head and Neck Trunk Extremities Total Hutchinson's melanomic freckle 22 2 10 34 Indeterminate 11 17 28 56 Nodular 19 33 73 125 Superficial spreading melanoma 16 54 115 185 Total 68 106 226 400

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