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Question

Given a radioactive sample having half - life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives.

A
$$\dfrac {31} {32}$$
B
$$\dfrac 1 {32}$$
C
$$\dfrac{3}{4}$$
D
$$\dfrac 4 5$$
Solution
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Correct option is A. $$\dfrac{3}{4}$$

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[IIT-JEE-2006]


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