The half life of a radio isotope is 20 hours. After 60 hours, how much amount will be left behind

Options :
  1. 1/8
  2. 1/2
  3. 3/4
  4. 1/16
Answer and Explanation :-

Answer: Option 1

Explanation:

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He could not stand. It was notThat he could not thrive, he was bornWith everything but the will -That can be deformed, just like a limb.Death was more interesting to him.Life could not get his attention.
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