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Assertion (A): B-basis allowables may be used for a member with redundant load paths.

Reason (R): B-basis figures carry ninety per cent survival at ninety-five per cent confidence.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the second gives the statistical meaning behind the first. Where a member's failure would be immediately critical, the more conservative A-basis value at ninety-nine per cent survival is required instead.

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