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+clear
+//Given
+N0=475
+N=270.0
+t=5.0
+
+//Calculation
+//
+a=N0/N
+l=log(a)/t
+T=1/l
+T1=0.693/l
+
+//Result
+printf("\n (i) The decay constant is %0.3f /minute",l)
+printf("\n (ii) Mean life is %0.2f minute",T)
+printf("\n (iii) Half life is %0.2f minute",T1)