Maximum possible value of reliability is
1
Software reliability is defined as the probability that a system operates without failure for a specified period of time in a specified environment.
Being a probability, reliability can only take values in the closed interval \(0 \le R(t) \le 1\).
\(R(t)=0\) means failure is certain, while \(R(t)=1\) means the system never fails in that period — this is the largest value reliability can reach.
The values 100 and 10 lie outside the range of a probability (100 would only appear if reliability were quoted as a percentage).
Hence, the answer is 1.
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