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+clear
+//Given
+N=3.67*10**10 //dis/second
+r=226.0
+A=6.023*10**23
+
+//Calculation
+n=A/r
+l=N/n
+D=0.693/l
+a=D/(3600.0*24.0*365.0)
+
+//Result
+printf("\n Half life of radium is %0.0f years",a)