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What section modulus is required for a Dense No. 1 grade Douglas-fir Larch, spanning 10 ft...

What section modulus is required for a Dense No. 1 grade Douglas-fir Larch, spanning 10 ft with a concentrate dead load of 5000 lb in the middle?

a. 96.77 in3

b. 107.52 in3

c. 250.76 in3

d. 1290.32 in3

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