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Question

এক খনড রেডাণের ৬০% ক্ষয় হতে কত সময় লাগবে ? রেডনের অর্ধায়ু 3.82 দিন ।

0.1164 days

0.986 days

0.1814 days

5 days

0.3324 days

ANS : 4

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