Discussion
Two alternatives have lives of 4 and 6 years. Under the least common multiple approach the study period is
Answer: D
Correct answer: 12 years
The least common multiple of 4 and 6 is 12, so the first alternative is repeated three times and the second twice. Choosing 24 would work arithmetically but is unnecessarily long, and using either life alone gives the unequal horizons the method exists to avoid.
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