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//Example 27_7
clc();
clear;
//To find what fraction of uranium remains undecayed today
t1=4.5*10^9 //Units in Years
lamda=0.693/t1 //Units in years^-1
t=4*10^9 //Units in Years
n_no=%e^(-lamda*t) //Units in Fractions
printf("The fraction of uranium remains undecayed today is=%.2f",n_no)
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