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কোনাে শ্রেণির নিম্ন সীমানা এবং উর্ধ্ব সীমানার মধ্যে পার্থক্যকে শ্রেণি প্রসার বা ব্যবধান বলা হয়।
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কোনাে শ্রেণির নিম্ন সীমানা এবং উর্ধ্ব সীমানার মধ্যে পার্থক্যকে শ্রেণি প্রসার বা ব্যবধান বলা হয়।