Rule 2 for calculating rise-to-run ratio is stated as _____

a. Tread width + riser height = 17? to 18?
b. Tread width + (2 × riser height) = 24? to 25?
c. Tread width + (3 × riser height) = 34? to 35?
d. Tread width × riser height = 70? to 75?


b

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