A chain is composed of identical links with reliability of 0.9. How many links must a chain have in order for its reliability to be less than 0.5? Hint: Reliability of a series system is Rs=R1*R2….*Rn, which equals 0.9 multiplied by itself n times to get less than 0.5. Hence, Rs-0.5=0.9. By applying Ln to both sides, ln(0.5)=n*Ln(0.9). Now solve for n to get the answer.

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A chain is composed of identical links with reliability of 0.9. How many links must a chain have in order for its reliability to be less than 0.5?

Hint: Reliability of a series system is Rs=R1*R2….*Rn, which equals 0.9 multiplied by itself n times to get less than 0.5. Hence, Rs-0.5=0.9. By applying Ln to both sides, ln(0.5)=n*Ln(0.9). Now solve for n to get the answer. 

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