Examlex
How many four-digit numbers can be formed under the following condition?
The leading digit cannot be zero and the number must be less than 7,000.
Racing Heart Rate
A rapid heartbeat, often exceeding the normal range for adults, which can be caused by physical exertion, stress, anxiety, or medical conditions.
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A mental health disorder characterized by persistent and excessive worry about various aspects of daily life, not linked to any specific cause.
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Interruptions in the normal sleep cycle that can negatively affect health and well-being.
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A medical condition characterized by pervasive feelings of sadness, hopelessness, and a lack of interest or pleasure in activities, diagnosed by a healthcare professional.
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