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There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of

1 : 1 1/2 : 2
2 : 1 1/2 : 1
1 : 1 : 2
none of these.

Correct Answer: 1 : 1 : 2

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