The mean lives of a radio-active substance are 1620 and 405 years for alpha and beta emmision respectively. Find the time during which 3/4 of sample will decay if it is decaying both the alpha and beta emmision simultanously

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The mean lives of a radio-active substance are 1620 and 405 years for alpha and beta emmision respectively. Find the time during which 3/4 of sample will decay if it is decaying both the alpha and bet

The mean lives of a radio-active substance are 1620 and 405 years for alpha and beta emmisionrespectively.
Find the time during which 3/4 of sample will decay if it is decaying both the alpha and beta emmision simultanously

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Length = 20;
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sample c;
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c) given below if it is executed from the command line
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/*sample.
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Assumptions

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