A) 1/8
B) 2/3
C) 7/8
D) 5/8
Correct Answer: C
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{15/5}}=\frac{1}{8}\] Þ Decayed fraction \[=1-\frac{1}{8}=\frac{7}{8}\]
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