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Modulus of section 'z' of hollow circular section with external diameter 'D' and internal diameter 'd' will be

Aπ/32d(D4 - d4)

Bπ/32D(D4 - d4)

Cπ/32(D3 – d3)

Dπ/32D(D3 - d3)

Answer:

B. π/32D(D4 - d4)


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